Composition of Air

COMPOSITION % by volume
N2 Nitrogen 78.03
O2 Oxygen 20.99
A Argon 0.94
CO2 Carbon dioxide 0.03
H2 Hydrogen 0.01
others parts per million
Ne Neon 0.001230
He Helium 0.000400
Kr Krypton 0.000050
Xe Xenon 0.000006
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