Liquefied petroleum gas, also referred to as liquid petroleum gas, is a fuel gas which contains a flammable mixture of hydrocarbon gases, specifically propane, n-butane and isobutane. It can sometimes contain some propylene, butylene, and isobutene.
LPG storage spheres
Two 45 kg (99 lb) LPG gas cylinders in New Zealand used for domestic supply
LPG minibuses in Hong Kong
A dual fuel LPG-powered Ford Falcon taxicab in Perth, Australia
Fuel gas is one of a number of fuels that under ordinary conditions are gaseous. Most fuel gases are composed of hydrocarbons, hydrogen, carbon monoxide, or mixtures thereof. Such gases are sources of energy that can be readily transmitted and distributed through pipes.
Blue flame of fuel gas burners
19th-century style gas lights in New Orleans