Butane (n-butane) is a flammable hydrocarbon gas liquefied through pressurisation.
It is classified as LPG, along with propane, isobutane and mixtures of these gases.
Butane is frequently used in Autogas in a propane-butane mix.
Butane comes from natural gas processing and oil refining.
It is used for heating and cooking, as well as auto fuel.