Canadian Medical Guide > Chemicals and Drugs > Inorganic Chemicals > Gases Terms and Definitions

Gases

Medical Definition:	The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Guide Notes:	does not include natural gas ( = GAS, NATURAL see FOSSIL FUELS); does not include blood gases ( = OXYGEN /blood or CARBON DIOXIDE /blood); gas embolism = EMBOLISM, AIR; intestinal gases = GASES + INTESTINES /physiol unless clinically referred to as FLATUL

Gases Categories.

	Ammonia - Ammonia. A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions.
	Nitrogen Oxides - Inorganic oxides that contain nitrogen.
	Sulfur Dioxide - A highly toxic, colorless, nonflammable gas. It is used as a pharmaceutical aid and antioxidant. It is also an environmental air pollutant.

Gases Medical Definitions and Terms

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