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Percentage Oxygen in Earth's Atmosphere

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on
Jul 24, 2020, 6:28:07 PM
Created by
on
May 5, 2014, 8:46:37 PM
OATM=20.95%
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Chemistry Atmospheric Science Biology Earth Science
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The Earth has 20.95% Oxygen by volumetric percentage of Oxygen present in a sample of the Earth's atmosphere.  Dry air by volume contains the following major constituents:

  • 78.09% nitrogen
  • 20.95% oxygen
  • 0.93% argon
  • 0.039% carbon dioxide

The amount of water vapor contained in air is on average 1% but varies.  (Humidity is a pain; gotta love Colorado.)
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