How much dry air is in our atmosphere?


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Air is the name given to atmosphere used in breathing and photosynthesis. Dry air, 99 percent, contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. Thanks!

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