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Chemistry > Gas Composition of Air


Page location: Info Library> Chemistry > Gas Composition of Air
The table below shows the average composition of the air on earth of each gas. The data is given in percent by volume at the temperature of 15°C and the pressure of 101325 Pa.

Name Symbol Percent by Volume
Nitrogen N2 78.084%
Oxygen O2 20.9476%
Argon Ar 0.934%
Carbon Dioxide CO2 0.0314%
Neon Ne 0.001818%
Methane CH4 0.0002%
Helium He 0.000524%
Krypton Kr 0.000114%
Hydrogen H2 0.00005%
Xenon Xe 0.0000087%