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Air is a mixture of various gases contributing to the earth's atmosphere. In general, air consists of molecular Nitrogen (N2) with a volume count of 78%, molecular oxygen (O2) with a volume count of 20%. There are also small amounts of Argon (Ar) with a volume of 1.9%, Neon (Ne), Helium (He), Methane (CH4), Krypton (Kr), Hydrogen (H), Nitrous Oxide (N2O) and Xenon (Xe). Other gases and elements like water vapour (H2O), Ozone (O3), Carbon-dioxide (CO2), Sulphur dioxide (SO2) and Nitrogen dioxide (NO2) are found in variable concentration. The ammonia and hydrogen sulphide are also common constituent of air