preproom.orgThe online science prep room
You are here: Info Library > Chemistry > Gas Composition of Air
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%