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Nitrogen, N2 and oxygen, O2

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The same gasses that comprise regular air: nitrogen, oxygen, carbon dioxide, water vapor, and trace amounts of others.


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Besides the gases that comprise air, air can also contain variable amounts of water vapor, characterized by the term, "relative humidity". Because the amount of water vapor held in air can change, it is simpler and more sensible to express component gas percentages on the basis of dry air. ProfHoff 830 (Always say of who you are citing)


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