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FACTS ABOUT GASES

Fact to remember Name of the gas
Gas most abundant in earth's atmosphere Nitrogen (78%)

Percentage of oxygen in earth's atmosphere 21% (appx)
The lightest gas Hydrogen

The heaviest gas Radon
Tear Gas Ammonia (NH3)

Marsh gas Methane
Laughing gas Nitrous Oxide (N2O)

Natural gas Mainly methane with small
quantities of ethane and
propane

Gobar gas Methane, CO2 and hydrogen
Gas with foul smell Hydrogen Sulphide (H2S)
Gas mixed with oxygen and given to Helium
patients with restricted breathing

A major air pollutant, the percentage Carbon monoxide
presence of which is checked in vehicle
pollution test

The gas which is responsible for the Nitrogen Dioxide
formation of brown air in traffic congested
cities
Major gaseous pollutant of areas located Suphur dioxide
near thermal power station

Strong smelling substance added to LPG Ethyl Mercaptan or Ethanethiol
Gases responsible for depletion of ozone Chloroflouro carbons
layer
Gas responsible for acid rain Sulphur dioxide

Gas used in gas welding and also artificial Acetylene
ripening of fruits

Gas used in electric bulbs Argon
Gas used in flourescent lamps Mercury vapour

Gas used in LPG Butane, Propane and Ethane
Gas used in refrigeration Freon (Diflouro Dichloro
Methane)
Gas used as an anaesthetic in dental Nitrous Oxide
surgery