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Liquefied petroleum gas
(also called LPG, LP Gas, or autogas) is a mixture of hydrocarbon gases
used as a fuel in heating appliances and vehicles, and increasingly
replacing chlorofluorocarbons as an aerosol propellant and a refrigerant
to reduce damage to the ozone layer. Varieties of LPG bought and sold
include mixes that are primarily propane, mixes that are primarily
butane, and the more common, mixes including both propane (60%) and
butane (40%), depending on the season n winter more propane, in summer
more butane. The international standard is EN 589.
LPG is manufactured during the refining of crude oil, or extracted from
oil or gas streams as they emerge from the ground.
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