The liquefied petroleum gases are butane, isobutane, propane, propylene (propene), butylenes (butenes) and any mixtures of these hydrocarbons in the generally accepted definition of the National Fire Protection Association.
The gases also denoted by terms LP-gases or LPG. They are flammable, colorless, noncorrosive, and nontoxic. The bigger component of LP gas is propane and butane. The LPG is used for: