Average Composition of the Atmosphere
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▪ TableAverage composition of the atmospheregas compositionby volume(ppm)* compositionby weight(ppm)* total mass(1020 g)nitrogen 780,900 755,100 38.648oxygen 209,500 231,500 11.841argon 9,300 12,800 0.655carbon dioxide 386 591 0.0299neon 18 12.5 0.000636helium 5.2 0.72 0.000037methane 1.5 0.94 0.000043krypton 1.0 2.9 0.000146nitrous oxide 0.5 0.8 0.000040hydrogen 0.5 0.035 0.000002ozone** 0.4 0.7 0.000035xenon 0.08 0.36 0.000018*ppm = parts per million.**Variable, increases with height.See as table:
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Universalium. 2010.
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