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Composition of Dry Air

Substance by volume

Nitrogen, N2 78.08

Oxygen, O2 20.95

Argon, Ar 0.93

Carbon dioxide, CO2 0.033

Neon, Ne 0.0018

Helium, He 0.00052

Methane, CH4 0.0002

Krypton, Kr 0.00011

Nitrogen(I) oxide, N2O 0.00005

Hydrogen, H2 0.00005

Xenon, Xe 0.0000087

Ozone, O3 0.000001

water vapour too

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13y ago

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