Liquefied petroleum gases LPG A group of hydrocarbon gases primarily propane normal butane and isobutane derived from crude oil refining or natural gas processing These gases may be marketed individually or mixed

Liquefied petroleum gas also referred to as LPG or LP gas is a fuel gas which contains a flammable mixture of hydrocarbon gases specifically propane nbutane and isobutane LPG any of several liquid mixtures of the volatile hydrocarbons propene propane butene and butane It was used as early as 1860 for a portable fuel source and its production and consumption for both domestic and industrial use have expanded ever since A typical commercial mixture may also contain ethane and ethylene as well as a volatile mercaptan an odorant added as a safety precaution