The Jacana Technical Library

Air and Gases

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 Composition of Air

Component of Air Symbol Content - % Volume
Nitrogen N2 78.084 %
Oxygen O2 20.947 %
Argon Ar 0.935 %
Carbon Dioxide CO2 0.033 %
Neon Ne 18.2 parts/million
Helium He 5.2 parts/million
Krypton Kr 1.1 parts/million
Sulphur Dioxide SO2 1.0 parts/million
Methane CH4 2.0 parts/million
Hydrogen H2 0.5 parts/million
Nitrous Oxide N2O 0.5 parts/million
Xenon Xe 0.09 parts/million
Ozone O3 0.0 to 0.07 parts/million
Ozone - Winter O3 0.0 to 0.02 parts/million
Nitrogen Dioxide NO2 0.02 parts/million
Iodine I2 0.01 parts/million
Carbon Monoxide CO 0.0 to trace
Ammonia NH3 0.0 to trace
The above table is an average for clean, dry air at sea level

 

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