A colorless, flammable gas, the fourth member of the alkane series of hydrocarbons. It has two isomers: n-butane is obtained from natural gas; isobutane (2-methylpropane) is made by the cracking of petroleum. Butane can be liquefied under pressure at normal temperatures and is used in bottled gas. It is also used in the manufacture of 1,3-butadiene and high-octane gasoline. Boiling point: (n-butane) -0.3°C (31.5°F) and (isobutane) -10.3°C (13.5°F).
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