what is liquid petroleum gas
LPG minibuses in Hong Kong. Liquified petroleum gas or liquid petroleum gas (LPG or LP gas), also referred to as simply propane or butane, are flammable mixtures of hydrocarbon gases used as fuel in heating appliances, cooking equipment, and vehicles.hen specifically used as a vehicle fuel it is often referred to as autogas. Varieties of LPG bought and sold include mixes that are primarily propane (C 3H 8), primarily butane (C 4H 10) and, most commonly, mixes including both propane and butane.