What is butane:
Butane is Either of two saturated hydrocarbons, or alkanes, with the chemical formula C4H10. Differences in structure between the two result in small but distinct differences in qualities. Both butanes occur in natural gas, petroleum, and refinery gases. They show little chemical reactivity at ordinary temperatures but burn readily when ignited in air or oxygen. They form part of gasoline and are sometimes added to propane to be marketed as bottled gas.