air

Science Dictionary
air   (âr)  Pronunciation Key 
The colorless, odorless, tasteless mixture of gases that surrounds the Earth. Air consists of about 78 percent nitrogen and 21 percent oxygen, with the remaining part made up mainly of argon, carbon dioxide, neon, helium, methane, and krypton in decreasing order of volume. Air also contains varying amounts of water vapor, particulate matter such as dust and soot, and chemical pollutants.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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