Gaseous Composition of the Atmosphere
 

Permanent Gases in the Atmosphere

  • Nitrogen (N2): 78.084% by volume
  • Oxygen (O2): 20.948%
  • Argon (Ar): 0.934%
  • Carbon dioxide (CO2): 0.033%
  • Other noble gases (Ne, He, Kr, Xe)
  • Hydrogen (H2)
  • Methane (CH4)
  • Nitrous oxide (N2O)
  • Carbon monoxide (CO)

Gases with Variable Concentration

  • Water vapour (H2O)
  • Ozone (O3)
  • Sulphur dioxide (SO2)
  • Nitrogen dioxide (NO2)
  • Ammonia (NH3)
  • Nitric oxide (NO)
  • Hydrogen sulphide (H2S)
  • Nitric acid vapour (HNO3)


The Earth's Atmosphere
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Please send comments/enquiries/suggestions about this tutorial to Dr. S. C. Liew at scliew@nus.edu.sg Copyright © CRISP, 2001