Percentage of oxygen and nitrogen in atmospheric air
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By volume, dry air contains 78.09%nitrogen, 20.95% oxygen, 0.93% argon,0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
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78.09% nitrogen,20.95% oxygen
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