Any main group molecular entity that is gaseous at standard temperature and pressure (STP; 0degreeC and 100 kPa).
| Member | Definition | Role |
|---|
| acetylene | | acetylene |
| ammonium hydroxide | An azane that consists of a single nitrogen atom covelently bonded to three hydrogen atoms. | ammonia |
| butane | A straight chain alkane composed of 4 carbon atoms. | butane |
| carbon monoxide | A one-carbon compound in which the carbon is joined only to a single oxygen. It is a colourless, odourless, tasteless, toxic gas. | carbon monoxide |
| chlorine | | dichlorine |
| ethane | An alkane comprising of two carbon atoms. | ethane |
| ethylene | | ethene |
| ethylene oxide | A saturated organic heteromonocyclic parent that is a three-membered heterocycle of two carbon atoms and one oxygen atom. | oxirane |
| fluorine | | difluorine |
| hydrobromic acid | A diatomic molecule containing covalently bonded hydrogen and bromine atoms. | hydrogen bromide |
| hydrochloric acid | A mononuclear parent hydride consisting of covalently bonded hydrogen and chlorine atoms. | hydrogen chloride |
| hydrogen | An elemental molecule consisting of two hydrogens joined by a single bond. | dihydrogen |
| hydrogen sulfide | A sulfur hydride consisting of a single sulfur atom bonded to two hydrogen atoms. A highly poisonous, flammable gas with a characteristic odour of rotten eggs, it is often produced by bacterial decomposition of organic matter in the absence of oxygen. | hydrogen sulfide |
| hydroiodic acid | A diatomic molecule containing covalently bonded hydrogen and iodine atoms. | hydrogen iodide |
| isobutylene | An alkene that is prop-1-ene substituted by a methyl group at position 2. | 2-methylprop-1-ene |
| methane | A one-carbon compound in which the carbon is attached by single bonds to four hydrogen atoms. It is a colourless, odourless, non-toxic but flammable gas (b.p. -161degreeC). | methane |
| methylacetylene | | propyne |
| nitrous oxide | A nitrogen oxide consisting of linear unsymmetrical molecules with formula N2O. While it is the most used gaseous anaesthetic in the world, its major commercial use, due to its solubility under pressure in vegetable fats combined with its non-toxicity in low concentrations, is as an aerosol spray propellant and aerating agent for canisters of 'whipped' cream. | dinitrogen oxide |
| ozone | An elemental molecule with formula O3. An explosive, pale blue gas (b.p. -112degreeC) that has a characteristic, pungent odour, it is continuously produced in the upper atmosphere by the action of solar ultraviolet radiation on atmospheric oxygen. It is an antimicrobial agent used in the production of bottled water, as well as in the treatment of meat, poultry and other foodstuffs. | ozone |
| perfluorobutane | A fluorocarbon that is butane in which all of the hydrogens have been replaced by fluorines. Microbubbles of preflubutane are used in the ultrasound contrast agent BR14. | perflubutane |
| propane | | propane |
| propylene | An alkene that is propane with a double bond at position 1. | propene |
| vinyl chloride | A monohaloethene that is ethene in which one of the hydrogens has been replaced by a chloro group. | chloroethene |
| vinyl fluoride | | fluoroethene |