Butane

Butane is an alkane with the formula C4H10. Butane exists as two isomers, n-butane, CH3CH2CH2CH3 and iso-butane, (CH3)3CH. Both isomers are highly flammable, colorless, easily liquefied gases that quickly vaporize at room temperature and pressure. Butanes are a trace component of natural gases, which contain higher concentrations of other hydrocarbons such as propane, ethane, and especially methane. Liquefied petroleum gas is a mixture of propane and some butanes.