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# The air we breathe is 21% oxygen. Is this a measurement of volume or weight?

Question #126676. Asked by serpa. (Aug 25 12 4:58 PM)

merrijig

Oxygen is 21 percent of the atmosphere by volume.

 Aug 25 12, 5:01 PM
sportsherald

"Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases." -from http://en.wikipedia.org/wiki/Atmosphere_of_Earth

 Aug 25 12, 5:36 PM

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