A chemical substance is a material with a specific chemical composition.[1]

A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Some typical chemical substances are diamond, gold, salt (sodium chloride) and sugar (sucrose). Generally, chemical substances exist as a solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure. Chemical reactions convert one chemical substance into another.

Forms of energy, such as light and heat, are not considered to be matter, and thus they are not "substances" in this regard.

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'Chemical' News
Mass. chemical leak sends 100-plus to hospitals - The Associated Press
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Mass. chemical leak sends 100-plus to hospitals

The Associated Press

Authorities said the chemicals were contained at the facility. Investigators are still trying to determine what type of chemical was leaked and its source, ...

MA investigators close to pinpointing chemical leak in New Bedford NECN

Over 100 hurt in New Bedford Massachusetts chemical release Examiner.com

3 reported critical after Mass. chemical leak The Associated Press

The Associated Press  - NECN  - NECN

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Tue Aug 4 06:40:58 2009
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