Average Composition of the Atmosphere

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

* * *


Universalium. 2010.

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