Liquefied petroleum gas (also called LPG, GPL, LP Gas, autogas, or
liquid propane gas) is a flammable mixture of hydrocarbon gases
used as a fuel in heating appliances and vehicles. It is
increasingly used as an aerosol propellant and a refrigerant,
replacingchlorofluorocarbons in an effort to reduce damage to the
ozone layer.Varieties of LPG bought and sold include mixes that are
primarily propane (C3H8), primarily butane (C4H*0) and, most
commonly, mixes including both propane and butane, depending on the
season — in winter more propane, in summer more butane. Propylene
and butylenes are usually also present in small concentration. A
powerful odorant, ethanethiol, is added so that leaks can be
detected easily. The international standard is EN **9.
