Any malodorous substance added to natural or LP-gas in small concentrations for the purpose of making the presence of the gas detectable
A substance, such as a mercaptan, that is added to odorless natural gas and natural gas liquids; gives them a characteristic smell and thus enables them to be detected
Substance giving a readily perceptible odor at low concentrations in the material into which it is mixed and used as a warning indication of the presence of the material, such as natural gas
A substance that stimulates the olfactory receptors (i e a chemical gas) [ASTM E253-97]
Any odorous substance; such as a chemical compound that has a characteristic odor