air
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(ār)
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[Gr. aēr, air]
The invisible, tasteless, odorless mixture of gases surrounding the earth. Air at sea level consists of approx. 78% nitrogen and 21% oxygen by volume. The remaining constituents are water vapor, carbon dioxide, and traces of ammonia, argon, helium, neon, krypton, xenon, rare gases, and some pollutants.-- To view the remaining sections of this topic, please log in or purchase a subscription --
(ār)
To hear audio pronunciation of this topic, purchase a subscription or log in.
[Gr. aēr, air]
The invisible, tasteless, odorless mixture of gases surrounding the earth. Air at sea level consists of approx. 78% nitrogen and 21% oxygen by volume. The remaining constituents are water vapor, carbon dioxide, and traces of ammonia, argon, helium, neon, krypton, xenon, rare gases, and some pollutants.There's more to see -- the rest of this entry is available only to subscribers.
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