Conversion of units refers to conversion factors between different units of measurement A unit of measurement is a definite magnitude of a physical quantity, defined and adopted by convention and/or by law, that is used as a standard for measurement of the same physical quantity. Any other value of the physical quantity can be expressed as a simple multiple of the unit of measurement for the same quantity Quantity is a kind of property which exists as magnitude or multitude. It is among the basic classes of things along with quality, substance, change, and relation. Quantity was first introduced as quantum, an entity having quantity. Being a fundamental term, quantity is used to refer to any type of quantitative properties or attributes of things.

Contents

Techniques

Process

The process of conversion depends on the specific situation and the intended purpose. This may be governed by regulation, contract In law, a contract is an agreement between two or more parties which, if it contains the elements of a valid legal agreement, is enforceable by law or by binding arbitration. That is to say, a contract is an exchange of promises with specific legal remedies for breach. These can include Compensatory remedy, whereby the defaulting party is required, Technical specifications A specification is an explicit set of requirements to be satisfied by a material, product, or service. Should a material, product or service fail to meet one or more of the applicable specifications, it may be referred to as being out of specification; the abbreviation OOS may also be used or other published standards A technical standard is an established norm or requirement. It is usually a formal document that establishes uniform engineering or technical criteria, methods, processes and practices. In contrast, a custom, convention, company product, corporate standard, etc. which becomes generally accepted and dominant is often called a de facto standard. Engineering judgment may include such factors as:

Some conversions from one system of units to another need to be exact, without increasing or decreasing the precision of the first measurement. This is sometimes called soft conversion. It does not involve changing the physical configuration of the item being measured.

By contrast, a hard conversion or an adaptive conversion may not be exactly equivalent. It changes the measurement to convenient and workable numbers and units in the new system. It sometimes involves a slightly different configuration, or size substitution, of the item.

Multiplication Factors

Conversion between units in the metric (SI The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. It is the world's most widely used system of measurement, both in everyday commerce and in science) system can be discerned by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10−6 metre). For a full listing of multiplication factors, see SI prefix The International System of Units specifies a set of unit prefixes known as SI prefixes or metric prefixes. An SI prefix is a name that precedes a basic unit of measure to indicate a decimal multiple or fraction of the unit. Each prefix has a unique symbol that is prepended to the unit symbol. The SI prefixes are standardized by the International.

Table Ordering

Within each table, the units are listed alphabetically, and the SI units (base or derived) are highlighted.

Tables of conversion factors

This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index. For each physical quantity, a number of different units (some only of historical interest) are shown and expressed in terms of the corresponding SI The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten. It is the world's most widely used system of measurement, both in everyday commerce and in science unit.

Legend
Symbol Definition
≡ exactly equal to
≈ approximately equal to
digits indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369…)
(H) of chiefly historical interest

Length

Length In certain contexts, the term "length" is reserved for a certain dimension of an object along which the length is measured. For example it is possible to cut a length of a wire which is shorter than wire thickness. Another example is FET transistors, in which the channel width may be larger than channel length
Name of unit Symbol Definition Relation to SI units
ångström The ångström or angstrom (pronounced /ˈæŋstrəm/; Swedish: [ˈɔŋstrøm]) is an internationally recognized unit of length equal to 0.1 nanometre or 1 × 10−10 metres. It is named after Anders Jonas Ångström. Although accepted for use, it is not formally defined within the International System of Units (SI) Å ≡ 1 × 10−10 m ≡ 0.1 nm
astronomical unit An astronomical unit is a unit of length equal to about 149,597,871 kilometres (92,955,807 miles). It is defined by the International Astronomical Union, and is defined as the mean distance between the Earth and the Sun over one Earth orbit AU ≈ Distance from Earth to Sun ≈ 149 597 871 464 m [1]
barleycorn (H) = ⅓ in An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the square inch and a corresponding unit of volume is the cubic inch. The inch is usually the universal unit of measurement in (see note above about rounding) ≈ 8.46 × 10−3 m
bohr, atomic unit of length Atomic units form a system of units convenient for atomic physics, electromagnetism, and quantum electrodynamics, especially when the focus is on the properties of electrons. There are two different kinds of atomic units, which one might name Hartree atomic units and Rydberg atomic units, which differ in the choice of the unit of mass and charge a0 ≡ Bohr radius In the Bohr model of the structure of an atom, put forward by Niels Bohr in 1913, electrons orbit a central nucleus. The model says that the electrons orbit only at certain distances from the nucleus, depending on their energy. In the simplest atom, hydrogen, a single electron orbits, and the smallest possible orbit for the electron, that with the of hydrogen ≈ 5.291 772 0859 × 10−11 ± 3.6 × 10−20 m [2]
cable length (Imperial) ≡ 608 ft A foot is a non-SI unit of length in a number of different systems including English units, Imperial units, and United States customary units. Its size can vary from system to system, but in each is around a quarter to a third of a meter. The most commonly used foot today is the international foot. There are three feet in a yard and 12 inches in a ≈ 185.3184 m
cable length A cable length or cable's length is a nautical unit of measure equal to one tenth of a nautical mile or 100 fathoms, or sometimes 120 fathoms. The unit is named after the length of a ship's anchor cable in the age of sail. The definition varies: (International) ≡ 1/10 nmi The nautical mile is a unit of length corresponding approximately to one minute of arc of latitude along any meridian. By international agreement it is exactly 1,852 metres (approximately 6,076 feet) ≡ 185.2 m
cable length (U.S.) ≡ 720 ft A foot is a non-SI unit of length in a number of different systems including English units, Imperial units, and United States customary units. Its size can vary from system to system, but in each is around a quarter to a third of a meter. The most commonly used foot today is the international foot. There are three feet in a yard and 12 inches in a = 219.456 m
chain A chain is a unit of length; it measures 66 feet or 22 yards or 4 rods or 100 links . There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British (Gunter's Edmund Gunter , English mathematician, of Welsh descent, was born in Hertfordshire in 1581; Surveyor's) ch ≡ 66 ft A foot is a non-SI unit of length in a number of different systems including English units, Imperial units, and United States customary units. Its size can vary from system to system, but in each is around a quarter to a third of a meter. The most commonly used foot today is the international foot. There are three feet in a yard and 12 inches in a(US) ≡ 4 rods The rod is a unit of length equal to 5.5 yards, 5.0292 metres, 16.5 feet, or 1⁄320 of a statute mile. A rod is the same length as a perch and a pole. The lengths of the perch and chain (four rods) were standardized in 1607 by Edmund Gunter. In old English, the term lug is also used [3] ≈ 20.116 84 m
cubit A cubit is the first recorded unit of length and was one of many different standards of measurement used through history. It was originally based on measuring by comparing to one's forearm length (H) ≡ Distance from fingers to elbow ≈ 18in ≈ 0.5 m
ell Several national forms existed, with different lengths, including the Scottish ell , the Flemish ell (approx. 27 in or 69 cm), the Polish ell (approx. 31 in or 79 cm) and the Danish ell (divided into a length just under 25 inches, approximately 63 cm) (H) ell ≡ 45 in [4] (In England usually) = 1.143 m
fathom A fathom is a unit of length in the Imperial system , used especially for measuring the depth of water fm ≡ 6 ft [4] = 1.8288 m
fermi The fermi is a non-SI unit of length that is internationally recognised and equivalent to the SI-recognised femtometre. The symbol for both the fermi and the femtometre is fm. The unit was named in honour of Enrico Fermi and is often encountered in nuclear physics as a characteristic of this scale fm ≡ 1 × 10−15 m [4] ≡ 1 × 10−15 m
finger ≡ 7/8 in = 0.022 225 m
finger (cloth) ≡ 4½ in = 0.1143 m
foot A foot is a non-SI unit of length in a number of different systems including English units, Imperial units, and United States customary units. Its size can vary from system to system, but in each is around a quarter to a third of a meter. The most commonly used foot today is the international foot. There are three feet in a yard and 12 inches in a (Benoît) (H) ft (Ben) ≈ 0.304 799 735 m
foot (Clarke's; Cape) (H) ft (Cla) ≈ 0.304 797 2654 m
foot (Indian) (H) ft Ind ≈ 0.304 799 514 m
foot (International) ft ≡ ⅓ yd ≡ 0.3048 m ≡ 12 inches ≡ 0.3048 m
foot (Sear's) (H) ft (Sear) ≈ 0.304 799 47 m
foot (U.S. Survey) ft (US) ≡ 1200/3937 m [5] ≈ 0.304 800 610 m
french The French scale is commonly used to measure the catheter size(Circumference is in millimeters), in which 1 Fr = 0.33 mm in diameter. In the French Gauge system as it is also known, the diameter in millimeters of the catheter can be determined by dividing the French size by 3, thus an increasing French size corresponds with a larger diameter; charriere F ≡ ⅓ mm = 3.3 × 10−4 m
furlong A furlong is a measure of distance in imperial units and U.S. customary units. It is equal to one-eighth of an international mile, to 220 yards, and to 660 feet. Since furlongs are not used for precision measurements, there is no need to consider other slightly different conversions fur ≡ 10 chains = 660 ft = 220 yd [4] = 201.168 m
hand It was originally based on the breadth of a male human hand, and is now standardized at 101.6 millimetres . When used to measure height, it is abbreviated "h" (for "hands") or "hh" ("hands high") ≡ 4 in [4] ≡ 0.1016 m
inch An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the square inch and a corresponding unit of volume is the cubic inch. The inch is usually the universal unit of measurement in (International) in ≡ 1/36 yd ≡ 1/12 ft ≡ 0.0254 m
league A league is a unit of length . It was long common in Europe and Latin America, but it is no longer an official unit in any nation. The league most frequently refers to the distance a person or a horse can walk in an hour, however, the league has multiple values (land) lea ≡ 3 US Statute miles [3] = 4 828.032 m
light-day Just as the second forms the basis for other units of time, the light-second can form the basis for other units of length, ranging from the light-nanosecond' to the light-minute, light-hour and light day' that are sometimes used in popular science publications ≡ 24 light-hours ≡ 2.590 206 837 12 × 1013 m
light-hour Just as the second forms the basis for other units of time, the light-second can form the basis for other units of length, ranging from the light-nanosecond to the light-minute, light-hour and light-day, which are sometimes used in popular science publications ≡ 60 light-minutes ≡ 1.079 252 8488 × 1012 m
light-minute A light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299 792 458 metres. It is just over 186,000 miles and almost 109 feet ≡ 60 light-seconds ≡ 1.798 754 748 × 1010 m
light-second A light-second is a unit of length useful in astronomy, telecommunications and relativistic physics. It is defined as the distance that light travels in free space in one second, and is equal to exactly 299 792 458 metres. It is just over 186,000 miles and almost 109 feet ≡ Distance light travels in one second in vacuum ≡ 299 792 458 m
light-year A light-year, also light year or lightyear, is a unit of length, equal to just under 10 trillion kilometres (1016 metres or 10 petametres). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year l.y. ≡ Distance light travels in vacuum in 365.25 days [6] = 9.460 730 472 5808 × 1015 m
line ln ≡ 1/12 in [7] = 0.002 116 m
link (Gunter's; Surveyor's) lnk ≡ 1/100 ch [4] ≡ 0.66ft ≡ 7.92in = 0.201 168 m
link (Ramsden's; Engineer's) lnk ≡ 1 ft [4] = 0.3048 m
metre The metre , symbol m, is the base unit of length in the International System of Units (SI). Originally intended to be one ten-millionth of the distance from the Earth's equator to the North Pole, its definition has been periodically refined to reflect growing knowledge of metrology. Since 1983, it is defined as the distance travelled by light in a (SI base unit The International System of Units defines seven units of measure as a basic set from which all other SI units are derived. These SI base units and their physical quantities are: ) m ≡ Distance light travels in 1/299 792 458 of a second in vacuum.[8] ≡ 1 m
mickey ≡ 1/200 in = 1.27 × 10−4 m
micron A micrometre is one millionth of a metre, or equivalently one thousandth of a millimetre or one thousand nanometres. It can also be written in scientific notation as 1×10−6 m, meaning 1⁄1000000 m µ ≡ 1 × 10−6 m
mil; thou A thou also known as a mil or point, is the verbalized abbreviation for "thousandth(s) of an inch", a unit of length incremented at 0.001 inch mil ≡ 1 × 10−3 in ≡ 2.54 × 10−5 m
mil A mil is a unit of length, usually used to measure geographic distance, fairly common in Norway and Sweden. Today, it measures by definition 10 kilometres, (≈6.2 miles) but earlier in history it had different values (Sweden and Norway) mil ≡ 10 km = 10 000 m
mile (geographical) The geographical mile is a unit of length determined by 1 minute of arc along the Earth's equator. For the 1924 International Spheriod this equalled 1855.4 metres. Any greater precision depends more on choice of standard than on more careful measurement: the length of the equator in the World Geodetic System WGS-84 is 40,075,016.6856 m which makes (H) ≡ 6082 ft = 1 853.7936 m
mile A mile is a unit of length in a number of different systems. In contemporary English, a mile most commonly refers to the statute mile of 5,280 feet , the survey mile of 5,280 survey feet (1,609.3472 metres (5,280.01 ft)) or the nautical mile of 1,852 metres (6,076.12 ft). It is about a third of the old measurement, the league (international) mi ≡ 80 chains ≡ 5280 ft ≡ 1760 yd ≡ 1 609.344 m
mile (tactical or data) ≡ 6000 ft ≡ 1828.8 m
mile (telegraph) (H) mi ≡ 6087 ft = 1 855.3176 m
mile (U.S. Survey) mi ≡ 5280 ft (US Survey feet) ≡ (5280 × 1200/3937) m ≈ 1 609.347 219 m
nail (cloth) ≡ 2¼ in [4] = 0.057 15 m
nautical league NL; nl ≡ 3 nmi [4] = 5556 m
nautical mile (Admiralty) NM (Adm); nmi (Adm) = 6080 ft ≈ 1853.184 m
nautical mile (international) NM; nmi ≡ 1852 m [9] ≡ 1852 m
nautical mile (US pre 1954) ≡ 1853.248 m ≡ 1853.248 m
pace ≡ 2.5 ft [4] = 0.762 m
palm ≡ 3 in [4] = 0.0762 m
parsec pc Distance of star with parallax shift of one arc second from a base of one astronomical unit ≈ 3.085 677 82 × 1016 ± 6 × 106 m [10]
pica ≡ 12 points Dependent on point measures.
point (American, English) [11][12] pt ≡ 1/72.272 in ≈ 0.000 351 450 m
point (Didot; European) [12][13] pt ≡ 1/12 × 1/72 of pied du roi; After 1878: ≡ 5/133 cm ≈ 0.000 375 97 m; After 1878: ≈ 0.000 375 939 85 m
point (PostScript) [11] pt ≡ 1/72 in = 0.000 352 7 m
point (TeX) [11] pt ≡ 1/72.27 in = 0.000 351 4598 m
quarter ≡ ¼ yd = 0.2286 m
rod; pole; perch (H) rd ≡ 16½ ft = 5.0292 m
rope (H) rope ≡ 20 ft [4] = 6.096 m
span (H) ≡ 9 in [4] = 0.2286 m
spat [14] ≡ 1 × 1012 m
stick (H) ≡ 2 in = 0.0508 m
stigma; bicron (picometre) pm ≡ 1 × 10−12 m
twip twp ≡ 1/1440 in = 1.7638 × 10−5 m
x unit; siegbahn xu ≈ 1.0021 × 10−13 m [4]
yard (International) yd ≡ 0.9144 m [5] ≡ 3 ft ≡ 36 in ≡ 0.9144 m

Area

Area
Name of unit Symbol Definition Relation to SI units
acre (international) ac ≡ 1 ch × 10 ch = 4840 sq yd ≡ 4 046.856 4224 m2
acre (U. S. survey) ac ≡ 10 sq ch = 4840 sq yd ≈ 4 046.873 m2 [15]
are a ≡ 100 m2 = 100 m2
barn b ≡ 10−28 m2 = 10−28 m2
barony ≡ 4000 ac ≈ 1.618 742 × 107 m2
board bd ≡ 1 in × 1 ft = 7.741 92 × 10−3 m2
boiler horsepower equivalent direct radiation bhp EDR ≡ (1 ft2) (1 bhp) / (240 BTUIT/h) ≈ 12.958 174 m2
circular inch circ in ≡ π/4 sq in ≈ 5.067 075 × 10−4 m2
circular mil; circular thou circ mil ≡ π/4 mil2 ≈ 5.067 075 × 10−10 m2
cord ≡ 192 bd = 1.486 448 64 m2
dunam ≡ 1 000 m2 = 1 000 m2
Guntha ≡ 33 ft x 33 ft[citation needed] ≈ 101.17 m2
hectare ha ≡ 10 000 m2 ≡ 10 000 m2
hide ≈ 120 ac (variable) ≈ 5 × 105 m2
rood ro ≡ ¼ ac = 1 011.714 1056 m2
section ≡ 1 mi × 1 mi = 2.589 988 110 336 × 106 m2
shed ≡ 10−52 m2 = 10−52 m2
square (roofing) ≡ 10 ft × 10 ft = 9.290 304 m2
square chain (international) sq ch ≡ 66 ft × 66 ft = 1/10 ac ≡ 404.685 642 24 m2
square chain (U.S. Survey) sq ch ≡ 66 ft(US) × 66 ft(US) = 1/10 ac ≈ 404.687 3 m2
square foot sq ft ≡ 1 ft × 1 ft ≡ 9.290 304 × 10−2 m2
square foot (U.S. Survey) sq ft ≡ 1 ft (US) × 1 ft (US) ≈ 9.290 341 161 327 49 × 10−2 m2
square inch sq in ≡ 1 in × 1 in ≡ 6.4516 × 10−4 m2
square kilometre km2 ≡ 1 km × 1 km = 106 m2
square link (Gunter's)(International) sq lnk ≡ 1 lnk × 1 lnk ≡ 0.66ft × 0.66ft = 4.046 856 4224 × 10−2 m2
square link (Gunter's)(US Survey) sq lnk ≡ 1 lnk × 1 lnk ≡ 0.66ft(US) × 0.66ft(US) ≈ 4.046 872 × 10−2 m2
square link (Ramsden's) sq lnk ≡ 1 lnk × 1 lnk ≡ 1ft × 1ft = 0.09290304 m2
square metre (SI unit) m2 ≡ 1 m × 1 m = 1 m2
square mil; square thou sq mil ≡ 1 mil × 1 mil = 6.4516 × 10−10 m2
square mile sq mi ≡ 1 mi × 1 mi = 2.589 988 110 336 × 106 m2
square mile (U.S. Survey) sq mi ≡ 1 mi (US) × 1 mi (US) ≈ 2.589 998 47 × 106 m2
square rod/pole/perch sq rd ≡ 1 rd × 1 rd = 25.292 852 64 m2
square yard (International) sq yd ≡ 1 yd × 1 yd ≡ 0.836 127 36 m2
stremma ≡ 1 000 m2 = 1 000 m2
township ≡ 36 sq mi (US) ≈ 9.323 994 × 107 m2
yardland ≈ 30 ac ≈ 1.2 × 105 m2

Volume

Volume
Name of unit Symbol Definition Relation to SI units
acre-foot ac ft ≡ 1 ac x 1 ft = 43 560 ft3 = 1 233.481 837 547 52 m3
acre-inch ≡ 1 ac × 1 in = 102.790 153 128 96 m3
barrel (Imperial) bl (Imp) ≡ 36 gal (Imp) = 0.163 659 24 m3
barrel (petroleum) bl; bbl ≡ 42 gal (US) = 0.158 987 294 928 m3
barrel (U.S. dry) bl (US) ≡ 105 qt (US) = 105/32 bu (US lvl) = 0.115 628 198 985 075 m3
barrel (U.S. fluid) fl bl (US) ≡ 31½ gal (US) = 0.119 240 471 196 m3
board-foot fbm ≡ 144 cu in ≡ 2.359 737 216 × 10−3 m3
bucket (Imperial) bkt ≡ 4 gal (Imp) = 0.018 184 36 m3
bushel (Imperial) bu (Imp) ≡ 8 gal (Imp) = 0.036 368 72 m3
bushel (U.S. dry heaped) bu (US) ≡ 1 ¼ bu (US lvl) = 0.044 048 837 7086 m3
bushel (U.S. dry level) bu (US lvl) ≡ 2 150.42 cu in = 0.035 239 070 166 88 m3
butt, pipe ≡ 126 gal (wine) = 0.476 961 884 784 m3
coomb ≡ 4 bu (Imp) = 0.145 474 88 m3
cord (firewood) ≡ 8 ft × 4 ft × 4 ft = 3.624 556 363 776 m3
cord-foot ≡ 16 cu ft = 0.453 069 545 472 m3
cubic fathom cu fm ≡ 1 fm × 1 fm × 1 fm = 6.116 438 863 872 m3
cubic foot cu ft ≡ 1 ft × 1 ft × 1 ft ≡ 0.028 316 846 592 m3
cubic inch cu in ≡ 1 in × 1 in × 1 in ≡ 16.387 064 × 10−6 m3
cubic metre (SI unit) m3 ≡ 1 m × 1 m × 1 m ≡ 1 m3
cubic mile cu mi ≡ 1 mi × 1 mi × 1 mi ≡ 4 168 181 825.440 579 584 m3
cubic yard cu yd ≡ 27 cu ft ≡ 0.764 554 857 984 m3
cup (breakfast) ≡ 10 fl oz (Imp) = 284.130 625 × 10−6 m3
cup (Canadian) c (CA) ≡ 8 fl oz (Imp) = 227.3045 × 10−6 m3
cup (metric) c ≡ 250.0 × 10−6 m3 = 250.0 × 10−6 m3
cup (U.S. customary) c (US) ≡ 8 US fl oz ≡ 1/16 gal (US) = 236.588 2365 × 10−6 m3
cup (U.S. food nutrition labeling) c (US) ≡ 240 mL[16] = 2.4×10−4 m3
dash (Imperial) ≡ 1/384 gi (Imp) = ½ pinch (Imp) = 369.961 751 302 08 3 × 10−9 m3
dash (U.S.) ≡ 1/96 US fl oz = ½ US pinch = 308.057 599 609 375 × 10−9 m3
dessertspoon (Imperial) ≡ 1/12 gi (Imp) = 11.838 776 0416 × 10−6 m3
drop (Imperial) gtt ≡ 1/288 fl oz (Imp) = 98.656 467 013 8 × 10−9 m3
drop (Imperial) (alt) gtt ≡ 1/1 824 gi (Imp) ≈ 77.886 684 × 10−9 m3
drop (medical) ≡ 1/12 ml = 83.03 × 10−9 m3
drop (metric) ≡ 1/20 mL = 50.0 × 10−9 m3
drop (U.S.) gtt ≡ 1/360 US fl oz = 82.148 693 22916 × 10−9 m3
drop (U.S.) (alt) gtt ≡ 1/456 US fl oz ≈ 64.854 231 × 10−9 m3
fifth ≡ 1/5 US gal = 757.082 3568 × 10−6 m3
firkin ≡ 9 gal (US) = 0.034 068 706 056 m3
fluid drachm (Imperial) fl dr ≡ ⅛ fl oz (Imp) = 3.551 632 8125 × 10−6 m3
fluid dram (U.S.); U.S. fluidram fl dr ≡ ⅛ US fl oz = 3.696 691 195 3125 × 10−6 m3
fluid scruple (Imperial) fl s ≡ 1/24 fl oz (Imp) = 1.183 877 60416 × 10−6 m3
gallon (beer) beer gal ≡ 282 cu in = 4.621 152 048 × 10−3 m3
gallon (Imperial) gal (Imp) ≡ 4.546  09 L ≡ 4.546 09 × 10−3 m3
gallon (U.S. dry) gal (US) ≡ ⅛ bu (US lvl) = 4.404 883 770 86 × 10−3 m3
gallon (U.S. fluid; Wine) gal (US) ≡ 231 cu in ≡ 3.785 411 784 × 10−3 m3
gill (Imperial); Noggin gi (Imp); nog ≡ 5 fl oz (Imp) = 142.065 3125 × 10−6 m3
gill (U.S.) gi (US) ≡ 4 US fl oz = 118.294 118 25 × 10−6 m3
hogshead (Imperial) hhd (Imp) ≡ 2 bl (Imp) = 0.327 318 48 m3
hogshead (U.S.) hhd (US) ≡ 2 fl bl (US) = 0.238 480 942 392 m3
jigger (bartending) ≡ 1½ US fl oz ≈ 44.36 × 10−6 m3
kilderkin ≡ 18 gal (Imp) = 0.081 829 62 m3
lambda λ ≡ 1 mm3 = 1 × 10−9 m3
last ≡ 80 bu (Imp) = 2.909 4976 m3
litre L ≡ 1 dm3 [17] ≡ 0.001 m3
load ≡ 50 cu ft = 1.415 842 3296 m3
minim (Imperial) min ≡ 1/480 fl oz (Imp) = 1/60 fl dr (Imp) = 59.193 880 208 3 × 10−9 m3
minim (U.S.) min ≡ 1/480 US fl oz = 1/60 US fl dr = 61.611 519 921 875 × 10−9 m3
ounce (fluid Imperial) fl oz (Imp) ≡ 1/160 gal (Imp) ≡ 28.413 0625 × 10−6 m3
ounce (fluid U.S. customary) US fl oz ≡ 1/128 gal (US) ≡ 29.573 529 5625 × 10−6 m3
ounce (fluid U.S. food nutrition labeling) US fl oz ≡ 30 mL[16] ≡ 3×10−5 m3
peck (Imperial) pk ≡ 2 gal (Imp) = 9.092 18 × 10−3 m3
peck (U.S. dry) pk ≡ ¼ US lvl bu = 8.809 767 541 72 × 10−3 m3
perch per ≡ 16½ ft × 1½ ft × 1 ft = 0.700 841 953 152 m3
pinch (Imperial) ≡ 1/192 gi (Imp) = ⅛ tsp (Imp) = 739.923 502 60416 × 10−9 m3
pinch (U.S.) ≡ 1/48 US fl oz = ⅛ US tsp = 616.115 199 218 75 × 10−9 m3
pint (Imperial) pt (Imp) ≡ ⅛ gal (Imp) = 568.261 25 × 10−6 m3
pint (U.S. dry) pt (US dry) ≡ 1/64 bu (US lvl) ≡ ⅛ gal (US dry) = 550.610 471 3575 × 10−6 m3
pint (U.S. fluid) pt (US fl) ≡ ⅛ gal (US) = 473.176 473 × 10−6 m3
pony ≡ 3/4 US fl oz = 22.180 147 171 875 × 10−6 m3
pottle; quartern ≡ ½ gal (Imp) = 80 fl oz (Imp) = 2.273 045 × 10−3 m3
quart (Imperial) qt (Imp) ≡ ¼ gal (Imp) = 1.136 5225 × 10−3 m3
quart (U.S. dry) qt (US) ≡ 1/32 bu (US lvl) = ¼ gal (US dry) = 1.101 220 942 715 × 10−3 m3
quart (U.S. fluid) qt (US) ≡ ¼ gal (US fl) = 946.352 946 × 10−6 m3
quarter; pail ≡ 8 bu (Imp) = 0.290 949 76 m3
register ton ≡ 100 cu ft = 2.831 684 6592 m3
sack (Imperial); bag ≡ 3 bu (Imp) = 0.109 106 16 m3[citation needed]
sack (U.S.) ≡ 3 bu (US lvl) = 0.105 717 210 500 64 m3
seam ≡ 8 bu (US lvl) = 0.281 912 561 335 04 m3[citation needed]
shot ≡ 1 US fl oz ≈ 29.57 × 10−6 m3
strike (Imperial) ≡ 2 bu (Imp) = 0.072 737 44 m3
strike (U.S.) ≡ 2 bu (US lvl) = 0.070 478 140 333 76 m3
tablespoon (Canadian) tbsp ≡ ½ fl oz (Imp) = 14.206 531 25 × 10−6 m3
tablespoon (Imperial) tbsp ≡ 5/8 fl oz (Imp) = 17.758 164 0625 × 10−6 m3
tablespoon (metric) ≡ 15.0 × 10−6 m3
tablespoon (U.S. customary) tbsp ≡ ½ US fl oz = 14.786 764 7825 × 10−6 m3
tablespoon (U.S. food nutrition labeling) tbsp ≡ 15 mL[16] = 1.5×10−5 m3
teaspoon (Canadian) tsp ≡ 1/6 fl oz (Imp) = 4.735 510 416 × 10−6 m3
teaspoon (Imperial) tsp ≡ 1/24 gi (Imp) = 5.919 388 02083 × 10−6 m3
teaspoon (metric) ≡ 5.0 × 10−6 m3 = 5.0 × 10−6 m3
teaspoon (U.S. customary) tsp ≡ 1/6 US fl oz = 4.928 921 595 × 10−6 m3
teaspoon (U.S. food nutrition labeling) tsp ≡ 5 mL[16] = 5×10−6 m3
timber foot ≡ 1 cu ft = 0.028 316 846 592 m3
ton (displacement) ≡ 35 cu ft = 0.991 089 630 72 m3
ton (freight) ≡ 40 cu ft = 1.132 673 863 68 m3
ton (water) ≡ 28 bu (Imp) = 1.018 324 16 m3
tun ≡ 252 gal (wine) = 0.953 923 769 568 m3
wey (U.S.) ≡ 40 bu (US lvl) = 1.409 562 806 6752 m3

Plane angle

Plane angle
Name of unit Symbol Definition Relation to SI units
angular mil µ ≡ 2π/6400 rad ≈ 0.981 748 × 10−3 rad
arcminute ' ≡ 1°/60 ≈ 0.290 888 × 10−3 rad
arcsecond " ≡ 1°/3600 ≈ 4.848 137 × 10−6 rad
centesimal minute of arc ' ≡ 1 grad/100 ≈ 0.157 080 × 10−3 rad
centesimal second of arc " ≡ 1 grad/(10 000) ≈ 1.570 796 × 10−6 rad
degree (of arc) ° ≡ 1/360 of a revolution ≡ π/180 rad ≈ 17.453 293 × 10−3 rad
grad; gradian; gon grad ≡ 1/400 of a revolution ≡ 2π/400 rad ≡ 0.9° ≈ 15.707 963 × 10−3 rad
octant ≡ 45° ≈ 0.785 398 rad
quadrant ≡ 90° ≈ 1.570 796 rad
radian (SI unit) rad The angle subtended at the center of a circle by an arc whose length is equal to the circle's radius. One full revolution encompasses 2π radians. = 1 rad
sextant ≡ 60° ≈ 1.047 198 rad
sign ≡ 30° ≈ 0.523 599 rad

Solid angle

Solid angle
Name of unit Symbol Definition Relation to SI units
steradian (SI unit) sr The solid angle subtended at the center of a sphere of radius r by a portion of the surface of the sphere having an area r2. A sphere encompasses 4π sr.[14] = 1 sr

Mass

Notes:

Mass
Name of unit Symbol Definition Relation to SI units
atomic mass unit, unified u; AMU ≈ 1.660 538 73 × 10−27 ± 1.3 × 10−36 kg
atomic unit of mass, electron rest mass me ≈ 9.109 382 15 × 10−31 ± 45 × 10−39 kg [18]
bag (coffee) ≡ 60 kg = 60 kg
bag (Portland cement) ≡ 94 lb av = 42.637 682 78 kg
barge ≡ 22½ sh tn = 20 411.656 65 kg
carat kt ≡ 3 1/6 gr ≈ 205.196 548 333 mg
carat (metric) ct ≡ 200 mg = 200 mg
clove ≡ 8 lb av = 3.628 738 96 kg
crith ≈ 89.9349 mg
dalton Da ≈ 1.660 902 10 × 10−27 ± 1.3 × 10−36 kg
dram (apothecary; troy) dr t ≡ 60 gr = 3.887 9346 g
dram (avoirdupois) dr av ≡ 27 11/32 gr = 1.771 845 195 3125 g
electronvolt eV ≡ 1 eV (energy unit) / c2 = 1.7826 × 10−36 kg
gamma γ ≡ 1 μg = 1 μg
grain gr ≡ 1/7000 lb av ≡ 64.798 91 mg
grave G grave was the original name of the kilogram ≡ 1 kg
hundredweight (long) long cwt or cwt ≡ 112 lb av = 50.802 345 44 kg
hundredweight (short); cental sh cwt ≡ 100 lb av = 45.359 237 kg
hyl (CGS unit) ≡ 1 gee × 1 g × 1 s2/m = 9.806 65 g
hyl (MKS unit) ≡ 1 gee × 1 kg × 1 s2/m = 9.806 65 kg
kilogram kg ≡ mass of the prototype near Paris (≈ mass of 1L of water) ≡ 1 kg (SI base unit)[8]
kip kip ≡ 1000 lb av = 453.592 37 kg
mark ≡ 8 oz t = 248.827 8144 g
mite ≡ 1/20 gr = 3.239 9455 mg
mite (metric) ≡ 1/20 g = 50 mg
ounce (apothecary; troy) oz t ≡ 1/12 lb t = 31.103 4768 g
ounce (avoirdupois) oz av ≡ 1/16 lb = 28.349 523 125 g
ounce (U.S. food nutrition labeling) oz ≡ 28 g[16] = 28 g
pennyweight dwt; pwt ≡ 1/20 oz t = 1.555 173 84 g
point ≡ 1/100 ct = 2 mg
pound (avoirdupois) lb av ≡ 0.453 592 37 kg = 7000 grains ≡ 0.453 592 37 kg
pound (metric) ≡ 500 g = 500 g
pound (troy) lb t ≡ 5 760 grains = 0.373 241 7216 kg
quarter (Imperial) ≡ 1/4 long cwt = 2 st = 28 lb av = 12.700 586 36 kg
quarter (informal) ≡ ¼ short tn = 226.796 185 kg
quarter, long (informal) ≡ ¼ long tn = 254.011 7272 kg
quintal (metric) q ≡ 100 kg = 100 kg
scruple (apothecary) s ap ≡ 20 gr = 1.295 9782 g
sheet ≡ 1/700 lb av = 647.9891 mg
slug; geepound slug ≡ 1 gee × 1 lb av × 1 s2/ft ≈ 14.593 903 kg
stone st ≡ 14 lb av = 6.350 293 18 kg
ton, assay (long) AT ≡ 1 mg × 1 long tn ÷ 1 oz t ≈ 32.666 667 g
ton, assay (short) AT ≡ 1 mg × 1 sh tn ÷ 1 oz t ≈ 29.166 667 g
ton, long long tn or ton ≡ 2 240 lb = 1 016.046 9088 kg
ton, short sh tn ≡ 2 000 lb = 907.184 74 kg
tonne (mts unit) t ≡ 1 000 kg = 1 000 kg
wey ≡ 252 lb = 18 st = 114.305 277 24 kg (variants exist)
Zentner Ztr. Definitions vary; see [19] and.[14]

Density

Density
Name of unit Symbol Definition Relation to SI units
gram per millilitre g/mL ≡ g/mL = 1,000 kg/m3
kilogram per cubic metre (SI unit) kg/m3 ≡ kg/m3 = 1 kg/m3
kilogram per litre kg/L ≡ kg/L = 1,000 kg/m3
ounce (avoirdupois) per cubic foot oz/ft3 ≡ oz/ft3 ≈ 1.001153961 kg/m3
ounce (avoirdupois) per cubic inch oz/in3 ≡ oz/in3 ≈ 1.729994044×103 kg/m3
ounce (avoirdupois) per gallon (Imperial) oz/gal ≡ oz/gal ≈ 6.236023291 kg/m3
ounce (avoirdupois) per gallon (U.S. fluid) oz/gal ≡ oz/gal ≈ 7.489151707 kg/m3
pound (avoirdupois) per cubic foot lb/ft3 ≡ lb/ft3 ≈ 16.01846337 kg/m3
pound (avoirdupois) per cubic inch lb/in3 ≡ lb/in3 ≈ 2.767990471×104 kg/m3
pound (avoirdupois) per gallon (Imperial) lb/gal ≡ lb/gal ≈ 99.77637266 kg/m3
pound (avoirdupois) per gallon (U.S. fluid) lb/gal ≡ lb/gal ≈ 119.8264273 kg/m3
slug per cubic foot slug/ft3 ≡ slug/ft3 ≈ 515.3788184 kg/m3

Time

Time, t
Name of unit Symbol Definition Relation to SI units
atomic unit of time au ≡ a0/(α·c) ≈ 2.418 884 254 × 10−17 s
Callippic cycle ≡ 441 mo (hollow) + 499 mo (full) = 76 a of 365.25 d = 2.398 3776 × 109 s
century ≡ 100 a (see below for definition of year length) = 100 × year
day d = 24 h = 86400 s
day (sidereal) d ≡ Time needed for the Earth to rotate once around its axis, determined from successive transits of a very distant astronomical object across an observer's meridian (International Celestial Reference Frame) ≈ 86 164.1 s
decade ≡ 10 a (see below for definition of year length) = 10 × year
fortnight ≡ 2 wk = 1 209 600 s
helek ≡ 1/1 080 h = 3.3 s
Hipparchic cycle ≡ 4 Callippic cycles - 1 d = 9.593 424 × 109 s
hour h ≡ 60 min = 3 600 s
jiffy ≡ 1/60 s = .016 s
jiffy (alternate) ≡ 1/100 s = 10 ms
ke (quarter of an hour) ≡ ¼ h = 1/96 d = 60 × 60 / 4 s = 900 s = 60 / 4 min = 15 min
ke (traditional) ≡ 1/100 d = 24 × 60 × 60 / 100 s = 864 s = 24 * 60 / 100 min = 14.4 min
lustre; lustrum ≡ 5 a of 365 d = 1.5768 × 108 s
Metonic cycle; enneadecaeteris ≡ 110 mo (hollow) + 125 mo (full) = 6940 d ≈ 19 a = 5.996 16 × 108 s
millennium ≡ 1 000 a (see below for definition of year length) = 1000 × year
milliday md ≡ 1/1 000 d = 24 × 60 × 60 / 1 000 s = 86.4 s
minute min ≡ 60 s = 60 s
moment ≡ 90 s = 90 s
month (full) mo ≡ 30 d[20] = 2 592 000 s
month (Greg. av.) mo Average Gregorian month = 365.2425/12 d = 30.436875 d ≈ 2.6297 × 106 s
month (hollow) mo ≡ 29 d[20] = 2 505 600 s
month (synodic) mo Cycle time of moon phases ≈ 29.530589 days (Average) ≈ 2.551 × 106 s
octaeteris = 48 mo (full) + 48 mo (hollow) + 3 mo (full)[21][22] = 8 a of 365.25 d = 2922 d = 2.524 608 × 108 s
Planck time ≡ (G ℏ/c5)½ ≈ 1.351 211 868 × 10−43 s
second s time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 K[8] (but other seconds are sometimes used in astronomy) (SI base unit)
shake ≡ 10−8 s = 10 ns
sigma ≡ 10−6 s = 1 μs
Sothic cycle ≡ 1 461 a of 365 d = 4.607 4096 × 1010 s
svedberg S ≡ 10−13 s = 100 fs
week wk ≡ 7 d = 604 800 s
year (Gregorian) a, y, or yr = 365.2425 d average, calculated from common years (365 d) plus leap years (366 d) on most years divisible by 4. See leap year for details. = 31 556 952 s
year (Julian) a, y, or yr = 365.25 d average, calculated from common years (365 d) plus one leap year (366 d) every four years = 31 557 600 s
year (sidereal) a, y, or yr ≡ time taken for Sun to return to the same position with respect to the stars of the celestial sphere ≈ 365.256 363 d ≈ 31 558 149.7632 s
year (tropical) a, y, or yr ≡ Length of time it takes for the Sun to return to the same position in the cycle of seasons ≈ 365.242 190 d ≈ 31 556 925 s
Where UTC is observed, the length of time units longer than 1 s may increase or decrease by 1 s if a leap second occurs during the time interval of interest.

Frequency

Frequency
Name of unit Symbol Definition Relation to SI units
hertz (SI unit) Hz ≡ Number of cycles per second = 1 Hz = 1/s
revolutions per minute rpm ≡ One unit rpm equals one rotation completed around a fixed axis in one minute of time. ≈ 0.104719755 rad/s

Speed or velocity

Speed
Name of unit Symbol Definition Relation to SI units
foot per hour fph ≡ 1 ft/h ≈ 8.466 667 × 10−5 m/s
foot per minute fpm ≡ 1 ft/min = 5.08 × 10−3 m/s
foot per second fps ≡ 1 ft/s = 3.048 × 10−1 m/s
furlong per fortnight ≡ furlong/fortnight ≈ 1.663 095 × 10−4 m/s
inch per minute ipm ≡ 1 in/min ≈ 4.23 333 × 10−4 m/s
inch per second ips ≡ 1 in/s = 2.54 × 10−2 m/s
kilometre per hour km/h ≡ 1 km/h ≈ 2.777 778 × 10−1 m/s
knot kn ≡ 1 NM/h = 1.852 km/h ≈ 0.514 444 m/s
knot (Admiralty) kn ≡ 1 NM (Adm)/h = 1.853 184 km/h[citation needed] = 0.514 773 m/s
mach number M Ratio of the speed to the speed of sound in the medium. Varies especially with temperature. About 761 mph (1225 kph) in air at sea level to about 660 mph (1062 kph) at jet altitudes. Unitless ≈ 340 to 295 m/s for aircraft
metre per second (SI unit) m/s ≡ 1 m/s = 1 m/s
mile per hour mph ≡ 1 mi/h = 0.447 04 m/s
mile per minute mpm ≡ 1 mi/min = 26.8224 m/s
mile per second mps ≡ 1 mi/s = 1 609.344 m/s
speed of light in vacuum c ≡ 299 792 458 m/s = 299 792 458 m/s
speed of sound in air s Varies especially with temperature. About 761 mph (1225 kph) in air at sea level to about 660 mph (1062 kph) at jet altitudes. ≈ 340 to 295 m/s at aircraft altitudes

A velocity consists of a speed combined with a direction; the speed part of the velocity takes units of speed.

Flow (volume)

Flow
Name of unit Symbol Definition Relation to SI units
cubic foot per minute CFM ≡ 1 ft3/min = 4.719474432×10−4 m3/s
cubic foot per second ft3/s ≡ 1 ft3/s = 0.028316846592 m3/s
cubic inch per minute in3/min ≡ 1 in3/min = 2.7311773 × 10−7 m3/s
cubic inch per second in3/s ≡ 1 in3/s = 1.6387064×10−5 m3/s
cubic metre per second (SI unit) m3/s ≡ 1 m3/s = 1 m3/s
gallon (U.S. fluid) per day GPD ≡ 1 gal/d = 4.381263638 × 10−8 m3/s
gallon (U.S. fluid) per hour GPH ≡ 1 gal/h = 1.051503273 × 10−6 m3/s
gallon (U.S. fluid) per minute GPM ≡ 1 gal/min = 6.30901964×10−5 m3/s
litre per minute LPM ≡ 1 L/min = 1.6 × 10−5 m3/s

Acceleration

Acceleration
Name of unit Symbol Definition Relation to SI units
foot per hour per second fph/s ≡ 1 ft/(h·s) ≈ 8.466 667 × 10−5 m/s2
foot per minute per second fpm/s ≡ 1 ft/(min·s) = 5.08 × 10−3 m/s2
foot per second squared fps2 ≡ 1 ft/s2 = 3.048 × 10−1 m/s2
gal; galileo Gal ≡ 1 cm/s2 = 10−2 m/s2
inch per minute per second ipm/s ≡ 1 in/(min·s) ≈ 4.233 333 × 10−4 m/s2
inch per second squared ips2 ≡ 1 in/s2 = 2.54 × 10−2 m/s2
knot per second kn/s ≡ 1 kn/s ≈ 5.144 444 × 10−1 m/s2
metre per second squared (SI unit) m/s2 ≡ 1 m/s2 = 1 m/s2
mile per hour per second mph/s ≡ 1 mi/(h·s) = 4.4704 × 10−1 m/s2
mile per minute per second mpm/s ≡ 1 mi/(min·s) = 26.8224 m/s2
mile per second squared mps2 ≡ 1 mi/s2 = 1.609 344 × 103 m/s2
standard gravity g ≡ 9.806 65 m/s2 = 9.806 65 m/s2

Force

Force
Name of unit Symbol Definition Relation to SI units
atomic unit of force ≡ me·α2·c2/a0 ≈ 8.238 722 06 × 10−8 N [23]
dyne (cgs unit) dyn ≡ g·cm/s2 = 10−5 N
kilogram-force; kilopond; grave-force kgf; kp; Gf ≡ g × 1 kg = 9.806 65 N
kip; kip-force kip; kipf; klbf ≡ g × 1 000 lb = 4.448 221 615 2605 × 103 N
milligrave-force, gravet-force mGf; gf ≡ g × 1 g = 9.806 65 mN
newton (SI unit) N A force capable of giving a mass of one kg an acceleration of one metre per second, per second.[24] = 1 N = 1 kg·m/s2
ounce-force ozf ≡ g × 1 oz = 0.278 013 850 953 7812 N
pound lb ≡ slug·ft/s2 = 4.448 230 531 N
pound-force lbf ≡ g × 1 lb = 4.448 221 615 2605 N
poundal pdl ≡ 1 lb·ft/s2 = 0.138 254 954 376 N
sthene (mts unit) sn ≡ 1 t·m/s2 = 1 × 103 N
ton-force tnf ≡ g × 1 sh tn = 8.896 443 230 521 × 103 N

See also: Conversion between weight (force) and mass

Pressure or mechanical stress

Pressure
Name of unit Symbol Definition Relation to SI units
atmosphere (standard) atm ≡ 101 325 Pa [25]
atmosphere (technical) at ≡ 1 kgf/cm2 = 9.806 65 × 104 Pa [25]
bar bar ≡ 105 Pa
barye (cgs unit) ≡ 1 dyn/cm2 = 0.1 Pa
centimetre of mercury cmHg ≡ 13 595.1 kg/m3 × 1 cm × g ≈ 1.333 22 × 103 Pa [25]
centimetre of water (4 °C) cmH2O ≈ 999.972 kg/m3 × 1 cm × g ≈ 98.0638 Pa [25]
foot of mercury (conventional) ftHg ≡ 13 595.1 kg/m3 × 1 ft × g ≈ 40.636 66 × 103 Pa [25]
foot of water (39.2 °F) ftH2O ≈ 999.972 kg/m3 × 1 ft × g ≈ 2.988 98 × 103 Pa [25]
inch of mercury (conventional) inHg ≡ 13 595.1 kg/m3 × 1 in × g ≈ 3.386 389 × 103 Pa [25]
inch of water (39.2 °F) inH2O ≈ 999.972 kg/m3 × 1 in × g ≈ 249.082 Pa [25]
kilogram-force per square millimetre kgf/mm2 ≡ 1 kgf/mm2 = 9.806 65 × 106 Pa [25]
kip per square inch ksi ≡ 1 kipf/sq in ≈ 6.894 757 × 106 Pa [25]
micron (micrometre) of mercury μmHg ≡ 13 595.1 kg/m3 × 1 μm × g ≈ 0.001 torr ≈ 0.133 3224 Pa [25]
millimetre of mercury mmHg ≡ 13 595.1 kg/m3 × 1 mm × g ≈ 1 torr ≈ 133.3224 Pa [25]
millimetre of water (3.98 °C) mmH2O ≈ 999.972 kg/m3 × 1 mm × g = 0.999 972 kgf/m2 = 9.806 38 Pa
pascal (SI unit) Pa ≡ N/m2 = kg/(m·s2) = 1 Pa [26]
pièze (mts unit) pz ≡ 1 000 kg/m·s2 = 1 × 103 Pa = 1 kPa
pound per square foot psf ≡ 1 lbf/ft2 ≈ 47.880 25 Pa [25]
pound per square inch psi ≡ 1 lbf/in2 ≈ 6.894 757 × 103 Pa [25]
poundal per square foot pdl/sq ft ≡ 1 pdl/sq ft ≈ 1.488 164 Pa [25]
short ton per square foot ≡ 1 sh tn × g / 1 sq ft ≈ 95.760 518 × 103 Pa
torr torr ≡ 101 325/760 Pa ≈ 133.3224 Pa [25]

Torque or moment of force

Torque
Name of unit Symbol Definition Relation to SI units
foot-pound force ft lbf ≡ g × 1 lb × 1 ft = 1.355 817 948 331 4004 N·m
foot-poundal ft pdl ≡ 1 lb·ft2/s2 = 4.214 011 009 380 48 × 10−2 N·m
inch-pound force in lbf ≡ g × 1 lb × 1 in = 0.112 984 829 027 6167 N·m
metre kilogram m kg ≡ N × m / g ≈ 0.101 971 621 N·m
Newton metre (SI unit) N·m ≡ N × m = kg·m2/s2 = 1 N·m

Energy, work, or amount of heat

Energy
Name of unit Symbol Definition Relation to SI units
barrel of oil equivalent bboe ≈ 5.8 × 106 BTU59 °F ≈ 6.12 × 109 J
British thermal unit (ISO) BTUISO ≡ 1.0545 × 103 J = 1.0545 × 103 J
British thermal unit (International Table) BTUIT = 1.055 055 852 62 × 103 J
British thermal unit (mean) BTUmean ≈ 1.055 87 × 103 J
British thermal unit (thermochemical) BTUth ≈ 1.054 350 × 103 J
British thermal unit (39 °F) BTU39 °F ≈ 1.059 67 × 103 J
British thermal unit (59 °F) BTU59 °F ≡ 1.054 804 × 103 J = 1.054 804 × 103 J
British thermal unit (60 °F) BTU60 °F ≈ 1.054 68 × 103 J
British thermal unit (63 °F) BTU63 °F ≈ 1.0546 × 103 J
calorie (International Table) calIT ≡ 4.1868 J = 4.1868 J
calorie (mean) calmean ≈ 4.190 02 J
calorie (thermochemical) calth ≡ 4.184 J = 4.184 J
calorie (3.98 °C) cal3.98 °C ≈ 4.2045 J
calorie (15 °C) cal15 °C ≡ 4.1855 J = 4.1855 J
calorie (20 °C) cal20 °C ≈ 4.1819 J
Celsius heat unit (International Table) CHUIT ≡ 1 BTUIT × 1 K/°R = 1.899 100 534 716 × 103 J
cubic centimetre of atmosphere; standard cubic centimetre cc atm; scc ≡ 1 atm × 1 cm3 = 0.101 325 J
cubic foot of atmosphere; standard cubic foot cu ft atm; scf ≡ 1 atm × 1 ft3 = 2.869 204 480 9344 × 103 J
cubic foot of natural gas ≡ 1 000 BTUIT = 1.055 055 852 62 × 106 J
cubic yard of atmosphere; standard cubic yard cu yd atm; scy ≡ 1 atm × 1 yd3 = 77.468 520 985 2288 × 103 J
electronvolt eV ≡ e × 1 V ≈ 1.602 177 33 × 10−19 ± 4.9 × 10−26 J
erg (cgs unit) erg ≡ 1 g·cm2/s2 = 10−7 J
foot-pound force ft lbf ≡ g × 1 lb × 1 ft = 1.355 817 948 331 4004 J
foot-poundal ft pdl ≡ 1 lb·ft2/s2 = 4.214 011 009 380 48 × 10−2 J
gallon-atmosphere (imperial) imp gal atm ≡ 1 atm × 1 gal (imp) = 460.632 569 25 J
gallon-atmosphere (US) US gal atm ≡ 1 atm × 1 gal (US) = 383.556 849 0138 J
hartree, atomic unit of energy Eh ≡ me·α2·c2 (= 2 Ry) ≈ 4.359 744 × 10−18 J
horsepower-hour hp·h ≡ 1 hp × 1 h = 2.684 519 537 696 172 792 × 106 J
inch-pound force in lbf ≡ g × 1 lb × 1 in = 0.112 984 829 027 6167 J
joule (SI unit) J The work done when a force of one newton moves the point of its application a distance of one metre in the direction of the force.[24] = 1 J = 1 m·N = 1 kg·m2/s2
kilocalorie; large calorie kcal; Cal ≡ 1 000 calIT = 4.1868 × 103 J
kilowatt-hour; Board of Trade Unit kW·h; B.O.T.U. ≡ 1 kW × 1 h = 3.6 × 106 J
litre-atmosphere l atm; sl ≡ 1 atm × 1 L = 101.325 J
quad ≡ 1015 BTUIT = 1.055 055 852 62 × 1018 J
rydberg Ry ≡ R∞·ℎ·c ≈ 2.179 872 × 10−18 J
therm (E.C.) ≡ 100 000 BTUIT = 105.505 585 262 × 106 J
therm (U.S.) ≡ 100 000 BTU59 °F = 105.4804 × 106 J
thermie th ≡ 1 McalIT = 4.1868 × 106 J
ton of coal equivalent TCE ≡ 7 Gcalth = 29.3076 × 109 J
ton of oil equivalent TOE ≡ 10 Gcalth = 41.868 × 109 J
ton of TNT tTNT ≡ 1 Gcalth = 4.184 × 109 J

Power or heat flow rate

Power
Name of unit Symbol Definition Relation to SI units
atmosphere-cubic centimetre per minute atm ccm ≡ 1 atm × 1 cm3/min = 1.688 75 × 10−3 W
atmosphere-cubic centimetre per second atm ccs ≡ 1 atm × 1 cm3/s = 0.101 325 W
atmosphere-cubic foot per hour atm cfh ≡ 1 atm × 1 cu ft/h = 0.797 001 244 704 W
atmosphere-cubic foot per minute atm·cfm ≡ 1 atm × 1 cu ft/min = 47.820 074 682 24 W
atmosphere-cubic foot per second atm cfs ≡ 1 atm × 1 cu ft/s = 2.869 204 480 9344 × 103 W
BTU (International Table) per hour BTUIT/h ≡ 1 BTUIT/h ≈ 0.293 071 W
BTU (International Table) per minute BTUIT/min ≡ 1 BTUIT/min ≈ 17.584 264 W
BTU (International Table) per second BTUIT/s ≡ 1 BTUIT/s = 1.055 055 852 62 × 103 W
calorie (International Table) per second calIT/s ≡ 1 calIT/s = 4.1868 W
foot-pound-force per hour ft lbf/h ≡ 1 ft lbf/h ≈ 3.766 161 × 10−4 W
foot-pound-force per minute ft lbf/min ≡ 1 ft lbf/min = 2.259 696 580 552 334 × 10−2 W
foot-pound-force per second ft lbf/s ≡ 1 ft lbf/s = 1.355 817 948 331 4004 W
horsepower (boiler) bhp ≈ 34.5 lb/h × 970.3 BTUIT/lb ≈ 9.810 657 × 103 W
horsepower (European electrical) hp ≡ 75 kp·m/s = 736 W
horsepower (Imperial electrical) hp ≡ 746 W = 746 W
horsepower (Imperial mechanical) hp ≡ 550 ft lbf/s = 745.699 871 582 270 22 W
horsepower (metric) hp ≡ 75 m kgf/s = 735.498 75 W
litre-atmosphere per minute L·atm/min ≡ 1 atm × 1 L/min = 1.688 75 W
litre-atmosphere per second L·atm/s ≡ 1 atm × 1 L/s = 101.325 W
lusec lusec ≡ 1 L·µmHg/s [14] ≈ 1.333 × 10−4 W
poncelet p ≡ 100 m kgf/s = 980.665 W
square foot equivalent direct radiation sq ft EDR ≡ 240 BTUIT/h ≈ 70.337 057 W
ton of air conditioning ≡ 1 t ice melted / 24 h ≈ 3 504 W
ton of refrigeration (Imperial) ≡ 1 BTUIT × 1 lng tn/lb ÷ 10 min/s ≈ 3.938 875 × 103 W
ton of refrigeration (IT) ≡ 1 BTUIT × 1 sh tn/lb ÷ 10 min/s ≈ 3.516 853 × 103 W
watt (SI unit) W The power which in one second of time gives rise to one joule of energy.[24] = 1 W = 1 J/s = 1 N·m/s = 1 kg·m2/s3

Action

Action
Name of unit Symbol Definition Relation to SI units
atomic unit of action au ≡ ℏ ≡ ℎ/2π ≈ 1.054 571 68 × 10−34 J·s[27]

Dynamic viscosity

Dynamic viscosity
Name of unit Symbol Definition Relation to SI units
pascal second (SI unit) Pa·s ≡ N·s/m2 , kg/(m·s) = 1 Pa·s
poise (cgs unit) P ≡ 10−1 Pa·s = 0.1 Pa·s
pound per foot hour lb/(ft·h) ≡ 1 lb/(ft·h) ≈ 4.133 789 × 10−4 Pa·s
pound per foot second lb/(ft·s) ≡ 1 lb/(ft·s) ≈ 1.488164 Pa·s
pound-force second per square foot lbf·s/ft2 ≡ 1 lbf·s/ft2 ≈ 47.88026 Pa·s
pound-force second per square inch lbf·s/in2 ≡ 1 lbf·s/in2 ≈ 6,894.757 Pa·s

Kinematic viscosity

Kinematic viscosity
Name of unit Symbol Definition Relation to SI units
square foot per second ft2/s ≡ 1 ft2/s = 0.09290304 m2/s
square metre per second (SI unit) m2/s ≡ 1 m2/s = 1 m2/s
stokes (cgs unit) St ≡ 10−4 m2/s = 10−4 m2/s

Electric current

Electric current
Name of unit Symbol Definition Relation to SI units
ampere (SI base unit) A ≡ The constant current needed to produce a force of 2 × 10−7 newton per metre between two straight parallel conductors of infinite length and negligible circular cross-section placed one metre apart in a vacuum.[8] = 1 A
electromagnetic unit; abampere (cgs unit) abamp ≡ 10 A = 10 A
esu per second; statampere (cgs unit) esu/s ≡ (0.1 A·m/s) / c ≈ 3.335641×10−10 A

Electric charge

Electric charge
Name of unit Symbol Definition Relation to SI units
abcoulomb; electromagnetic unit (cgs unit) abC; emu ≡ 10 C = 10 C
atomic unit of charge au ≡ e ≈ 1.602 176 462 × 10−19 C
coulomb (SI unit) C ≡ The amount of electricity carried in one second of time by one ampere of current.[24] = 1 C = 1 A·s
faraday F ≡ 1 mol × NA·e ≈ 96 485.3383 C
statcoulomb; franklin; electrostatic unit (cgs unit) statC; Fr; esu ≡ (0.1 A·m) / c ≈ 3.335 641 × 10−10 C

Electric dipole

Electric dipole
Name of unit Symbol Definition Relation to SI units
atomic unit of electric dipole moment ea0 ≈ 8.478 352 81 × 10−30 C·m[28]

Electromotive force, electric potential difference

Voltage, electromotive force
Name of unit Symbol Definition Relation to SI units
abvolt (cgs unit) abV ≡ 1 × 10−8 V = 1 × 10−8 V
statvolt (cgs unit) statV ≡ c· (1 μJ/A·m) = 299.792 458 V
volt (SI unit) V The difference in electric potential across two points along a conducting wire carrying one ampere of constant current when the power dissipated between the points equals one watt.[24] = 1 V = 1 W/A = 1 kg·m2/(A·s3)

Electrical resistance

Electrical resistance
Name of unit Symbol Definition Relation to SI units
ohm (SI unit) Ω The resistance between two points in a conductor when one volt of electric potential difference, applied to these points, produces one ampere of current in the conductor.[24] = 1 Ω = 1 V/A = 1 kg·m2/(A2·s3)

Capacitance

Capacitor's ability to store charge
Name of unit Symbol Definition Relation to SI units
farad (SI unit) F The capacitance between two parallel plates that results in one volt of potential difference when charged by one coulomb of electricity.[24] = 1 F = 1 C/V = 1 A2·s4/(kg·m2)

Magnetic flux

magnetic flux
Name of unit Symbol Definition Relation to SI units
maxwell (CGS unit) Mx ≡ 10−8 Wb[29] = 1 × 10−8 Wb
weber (SI unit) Wb Magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.[24] = 1 Wb = 1 V·s = 1 kg·m2/(A·s2)

Magnetic flux density

What physicists call Magnetic field is called Magnetic flux density by electrical engineers and magnetic induction by applied mathematicians and electrical engineers.
Name of unit Symbol Definition Relation to SI units
gauss (CGS unit) G ≡ Mx/cm2 = 10−4 T = 1 × 10−4 T [30]
tesla (SI unit) T ≡ Wb/m2 = 1 T = 1 Wb/m2 = 1 kg/(A·s2)

Inductance

Inductance
Name of unit Symbol Definition Relation to SI units
henry (SI unit) H The inductance of a closed circuit that produces one volt of electromotive force when the current in the circuit varies at a uniform rate of one ampere per second.[24] = 1 H = 1 Wb/A = 1 kg·m2/(A·s)2

Temperature

For more details on this topic, see Temperature conversion.
Temperature
Name of unit Symbol Definition Conversion to kelvin
degree Celsius °C °C = K − 273.15. A unit of °C is the same size as a unit of K; however, their numerical values differ as the zero point of Celsius is set at 273.15 K (the ice point).[8] [K] = [°C] + 273.15
degree Delisle °De [K] = 373.15 − [°De] × 2/3
degree Fahrenheit °F 0 °F ≡ freezing pt. of H2O+NaCl, 180°F between freezing and boiling pt of H2O @ 1atm [K] = ([°F] + 459.67) × 5/9
degree Newton °N [K] = [°N] × 100/33 + 273.15
degree Rankine °R; °Ra 0 °R ≡ absolute zero [K] = [°R] × 5/9
degree Réaumur °Ré [K] = [°Ré] × 5/4 + 273.15
degree Rømer °Rø [K] = ([°Rø] − 7.5) × 40/21 + 273.15
kelvin (SI base unit) K ≡ 1/273.16 of the thermodynamic temperature of the triple point of water.[8] 1 K

Information entropy

Information entropy
Name of unit Symbol Definition Relation to SI units Relation to bits
SI unit J/K ≡ J/K = 1 J/K
nat; nip; nepit nat ≡ kB = 1.380 650 5(23) × 10−23 J/K
bit; shannon bit; b; Sh ≡ ln(2) × kB = 9.569 940 (16) × 10−24 J/K = 1 bit
ban; hartley ban; Hart ≡ ln(10) × kB = 3.179 065 3(53) × 10−23 J/K
nibble ≡ 4 bits = 3.827 976 0(64) × 10−23 J/K = 22 bit
byte B ≡ 8 bits = 7.655 952 (13) × 10−23 J/K = 23 bit
kilobyte (decimal) kB ≡ 1 000 B = 7.655 952 (13) × 10−20 J/K
kilobyte (kibibyte) KB; KiB ≡ 1 024 B = 7.839 695 (13) × 10−20 J/K = 210 bit

Often, information entropy is measured in shannons, whereas the (discrete) storage space of digital devices is measured in bits. Thus, uncompressed redundant data occupy more than one bit of storage per shannon of information entropy. The multiples of a bit listed above are usually used with this meaning. Other times the bit is used as a measure of information entropy and is thus a synonym of shannon.

Luminous intensity

The candela is the preferred nomenclature for the SI unit.

Luminous intensity
Name of unit Symbol Definition Relation to SI units
candela (SI base unit); candle cd The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.[8] = 1 cd
candlepower (new) cp ≡ cd The use of candlepower as a unit is discouraged due to its ambiguity. = 1 cd
candlepower (old, pre-1948) cp Varies and is poorly reproducible.[31] Approximately 0.981 cd.[14] ≈ 0.981 cd

Luminance

Luminance
Name of unit Symbol Definition Relation to SI units
candela per square foot cd/ft2 ≡ cd/ft2 ≈ 10.763910417 cd/m2
candela per square inch cd/in2 ≡ cd/in2 ≈ 1,550.0031 cd/m2
candela per square metre (SI unit); nit (deprecated[14]) cd/m2 ≡ cd/m2 = 1 cd/m2
footlambert fL ≡ (1/π) cd/ft2 ≈ 3.4262590996 cd/m2
lambert L ≡ (104/π) cd/m2 ≈ 3,183.0988618 cd/m2
stilb (CGS unit) sb ≡ 104 cd/m2 ≈ 1 × 104 cd/m2

Luminous flux

Luminous flux
Name of unit Symbol Definition Relation to SI units
lumen (SI unit) lm ≡ cd·sr = 1 lm = 1 cd·sr

Illuminance

Illuminance
Name of unit Symbol Definition Relation to SI units
footcandle; lumen per square foot fc ≡ lm/ft2 = 10.763910417 lx
lumen per square inch lm/in2 ≡ lm/in2 ≈ 1,550.0031 lx
lux (SI unit) lx ≡ lm/m2 = 1 lx = 1 lm/m2
phot (CGS unit) ph ≡ lm/cm2 = 1 × 104 lx

Radiation - source activity

Radioactivity
Name of unit Symbol Definition Relation to SI units
becquerel (SI unit) Bq ≡ Number of disintegrations per second = 1 Bq = 1/s
curie Ci ≡ 3.7 × 1010 Bq = 3.7 × 1010 Bq [32]
rutherford (H) rd ≡ 1 MBq = 1 × 106 Bq

Please note that although becquerel (Bq) and hertz (Hz) both ultimately refer to the same SI base unit (s−1), Hz is used only for periodic phenomena, and Bq is only used for stochastic processes associated with radioactivity.[33]

Radiation - exposure

Radiation - exposure
Name of unit Symbol Definition Relation to SI units
roentgen R 1 R ≡ 2.58 × 10−4 C/kg[29] = 2.58 × 10−4 C/kg

The roentgen is not a SI unit and the NIST strongly discourages its continued use.[34]

Radiation - absorbed dose

Radiation - absorbed dose
Name of unit Symbol Definition Relation to SI units
gray (SI unit) Gy ≡ 1 J/kg = 1 m2/s2 [35] = 1 Gy
rad rad ≡ 0.01 Gy[29] = 0.01 Gy

Radiation - equivalent dose

Radiation - equivalent dose
Name of unit Symbol Definition Relation to SI units
Röntgen equivalent man rem ≡ 0.01 Sv = 0.01 Sv
sievert (SI unit) Sv ≡ 1 J/kg[33] = 1 Sv

Although the definitions for sievert (Sv) and gray (Gy) would seem to indicate that they measure the same quantities, this is not the case. The effect of receiving a certain dose of radiation (given as Gy) is variable and depends on many factors, thus a new unit was needed to denote the biological effectiveness of that dose on the body; this is known as the equivalent dose and is shown in Sv. The general relationship between absorbed dose and equivalent dose can be represented as

H = Q · D

where H is the equivalent dose, D is the absorbed dose, and Q is a dimensionless quality factor. Thus, for any quantity of D measured in Gy, the numerical value for H measured in Sv may be different.[36]

Software tools

Home and office computers come with converters in bundled spreadsheet applications or can access free converters via the Internet. Units and measurements can be easily converted using these tools, but only if the units are explicitly defined and the conversion is compatible (e.g., cmHg to kPa).

Free conversion software

General commercial sources of converters

See also

Wikibooks has a book on the topic of FHSST Physics Units:How to Change Units

References

  1. ^ United States Naval Observatory. (2009). Selected Astronomical Constants, 2009. Accessed May 10, 2009
  2. ^ "NIST Reference on Constants, Units, and Uncertainty."(2006). National Institute of Standards and Technology. Retrieved February 22, 2008.
  3. ^ a b National Institute of Standards and Technology General Tables of Units of Measurement
  4. ^ a b c d e f g h i j k l m n Lide, D. (Ed.). (1990). Handbook of Chemistry and Physics (71st ed). Boca Raton, FL: CRC Press. Section 1.
  5. ^ a b National Bureau of Standards. (June 30, 1959). Refinement of values for the yard and the pound. Federal Register, viewed September 20, 2006 at National Geodetic Survey web site.
  6. ^ The International Astronomical Union and Astronomical Units
  7. ^ Klein, Herbert Arthur. (1988). The Science of Measurement: a Historical Survey. Mineola, NY: Dover Publications 0-4862-5839-4.
  8. ^ a b c d e f g The International System of Units, Section 2.1 (8 ed.), Bureau International des Poids et Mesures, 2006, http://www.bipm.org/en/si/si_brochure/chapter2/2-1/, retrieved August 26, 2009
  9. ^ International System of Units, 8th ed. (2006), Bureau International des Poids et Mesures, Section 4.1 Table 8.
  10. ^ P. Kenneth Seidelmann, Ed. (1992). Explanatory Supplement to the Astronomical Almanac. Sausalito, CA: University Science Books. p. 716 and s.v. parsec in Glossary.
  11. ^ a b c Whitelaw, Ian. (2007). A Measure of All Things: The Story of Man and Measurement. New York: Macmillan 0-312-37026-1. p. 152.
  12. ^ a b De Vinne, Theodore Low (1900). The practice of typography: a treatise on the processes of type-making, the point system, the names, sizes, styles and prices of plain printing types 2nd ed. New York: The Century Co. p. 142–150.
  13. ^ Pasko, Wesley Washington (1894). American dictionary of printing and bookmaking. (1894). New York: Howard Lockwood. p. 521.
  14. ^ a b c d e f Rowlett, Russ (2005), How Many? A Dictionary of Units of Measurement, http://www.unc.edu/~rowlett/units/index.html
  15. ^ Thompson, A. and Taylor, B.N. (2008). Guide for the Use of the International System of Units (SI). National Institute of Standards and Technology Special Publication 811. p. 57.
  16. ^ a b c d e U.S. Code of Federal Regulations, Title 21, Section 101.9, Paragraph (b)(5)(viii), http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&rgn=div8&view=text&node=21:2.0.1.1.2.1.1.6&idno=21, retrieved August 29, 2009
  17. ^ Barry N. Taylor, Ed.,NIST Special Publication 330: The International System of Units (SI) (2001 Edition), Washington: U.S. Government Printing Office, 43,"The 12th Conference Generale des Poids et Mesures (CGPM)…declares that the word “litre” may be employed as a special name for the cubic decimetre".
  18. ^ CODATA Value: atomic uint of mass. (2006). National Institute of Standards and Technology. Retrieved 16 September 2008.
  19. ^ The Swiss Federal Office for Metrology gives Zentner on a German language web page [1] and quintal on the English translation of that page [2]; the unit is marked "spécifiquement suisse !"
  20. ^ a b Pedersen O. (1983). "Glossary" in Coyne, G., Hoskin, M., and Pedersen, O. Gregorian Reform of the Calendar: Proceedings of the Vatican Conference to Commemorate its 400th Anniversary. Vatican Observatory. Available from Astrophysics Data System.
  21. ^ Richards, E.G. (1998), Mapping Time, Oxford University Press, pp. 94–95, ISBN 0-19-850413-6
  22. ^ Steel, Duncan (2000), Marking Time, John Wiley & Sons, p. 46, ISBN 0-471-29827-1
  23. ^ CODATA Value: atomic unit of force. (2006). National Institute of Standards and Technology. Retrieved September 14, 2008.
  24. ^ a b c d e f g h i Comité International des Poids et Mesures, Resolution 2, 1946, http://www.bipm.org/en/CIPM/db/1946/2/, retrieved August 26, 2009
  25. ^ a b c d e f g h i j k l m n o p Barry N. Taylor, (April 1995), Guide for the Use of the International System of Units (SI) (NIST Special Publication 811), Washington, DC: U.S. Government Printing Office, pp. 57–68.
  26. ^ Barry N. Taylor, (April 1995), Guide for the Use of the International System of Units (SI) (NIST Special Publication 811), Washington, DC: U.S. Government Printing Office, p. 5.
  27. ^ International System of Units, 8th ed. (2006), Bureau International des Poids et Mesures, Section 4.1 Table 7.
  28. ^ The NIST Reference on Constants, Units, and Uncertainty, 2006, http://physics.nist.gov/cgi-bin/cuu/Value?auedm, retrieved August 26, 2009
  29. ^ a b c NIST Guide to SI Units, Appendix B.9, http://physics.nist.gov/Pubs/SP811/appenB9.html, retrieved August 27, 2009
  30. ^ Standard for the Use of the International System of Units (SI): The Modern Metric System IEEE/ASTM SI 10-1997. (1997). New York and West Conshohocken, PA: Institute of Electrical and Electronics Engineers and American Society for Testing and Materials. Tables A.1 through A.5.
  31. ^ The NIST Reference on Constants, Units, and Uncertainty, http://physics.nist.gov/cuu/Units/candela.html, retrieved August 28, 2009
  32. ^ Ambler Thompson & Barry N. Taylor. (2008). Guide for the Use of the International System of Units (SI). Special Publication 811. Gaithersburg, MD: National Institute of Standards and Technology. p. 10.
  33. ^ a b The International System of Units, Section 2.2.2., Table 3 (8 ed.), Bureau International des Poids et Mesures, 2006, http://www.bipm.org/en/si/si_brochure/chapter2/2-2/table3.html, retrieved August 27, 2009
  34. ^ The NIST Guide to the SI (Special Publication 811), section 5.2, 2008, http://physics.nist.gov/Pubs/SP811/sec05.html#5.2, retrieved August 27, 2009
  35. ^ Ambler Thompson & Barry N. Taylor. (2008). Guide for the Use of the International System of Units (SI). (Special Publication 811. Gaithersburg, MD: National Institute of Standards and Technology. p. 5.
  36. ^ Comité international des poids et mesures, 2002, Recommendation 2, http://www.bipm.org/en/CIPM/db/2002/2/, retrieved August 27, 2009

External links

Systems of measurement
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International System of Units · metre-kilogram-second · centimetre-gram-second · metre-tonne-second · gravitational system
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Conversion of units in Physics,i need assistance ,pls!?
Q. How do I convert 200mg/mL to 1)mcg/mL 2)g/L 3)ng/mcg?
Asked by NUMBer - Fri Apr 25 09:11:16 2008 - - 2 Answers - 0 Comments

A. 200 mg/mL = 2000 ueg/mL (assuming "mc" is ue) 200 mg/mL = 0.2 g/mL 200 mg/mL = 2000 ng/mL = 2000 ng/ueL the first and most important thing any engineer or technician (or anyone living in the modern world) is learn the prefixes for the metric system. The basic ones are very simple. c (cent) = x100 k (kilo) = x1000 M (Meg) = x1000 G (Gig) = x1000 m (milli) = /1000 ue (micro) = /1000 n (nano) = /1000 p (pico) = /1000
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