| 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 patients with restricted breathing | Helium |
| A major air pollutant, the percentage presence of which is checked in vehicle pollution test | Carbon monoxide |
| The gas which is responsible for the formation of brown air in traffic congested cities | Nitrogen Dioxide |
| Major gaseous pollutant of areas located near thermal power station | Suphur dioxide |
| Strong smelling substance added to LPG | Ethyl Mercaptan or Ethanethiol |
| Gases responsible for depletion of ozone layer | Chloroflouro carbons |
| Gas responsible for acid rain | Sulphur dioxide |
| Gas used in gas welding and also artificial ripening of fruits | Acetylene |
| 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 surgery | Nitrous Oxide |
