Composition of Air
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11 Terms
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Main gases in air
Nitrogen (~78%), Oxygen (~21%), Argon (~0.93%), Carbon dioxide (~0.04%)
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Percentage of nitrogen in air
About 78%
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Percentage of oxygen in air
About 21%
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Percentage of argon in air
About 0.93%
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Percentage of carbon dioxide in air
About 0.04%
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Role of nitrogen in air
Inert gas, dilutes oxygen, prevents rapid burning.
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Role of oxygen in air
Supports combustion and respiration.
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Role of carbon dioxide in air
Absorbs infrared radiation, contributes to the greenhouse effect.
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Role of argon in air
Inert noble gas, used in light bulbs and welding.
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What is “dry air”?
Air without water vapor.
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Typical water vapor content in air
Varies, usually up to about 1% depending on humidity.
Note 
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