| Section2 = | Section7 = | Section8 = }}Butane, also called n-butane', is the unbranched alkane with four carbon atoms, CH3CH2CH2CH3. Butane is also used as a collective term for n-butane together with its only other isomer, isobutane (also called methylpropane), CH(CH3)3. Butanes are highly flammable, colorless, easily liquefied gases. The name butane was derived by back-formation from the name of butyric acid. Image:Butane-2D-Skeletal.svg|n-ButaneImage:I-Butane-2D-Skeletal.svg|i-Butane Reactions and uses When oxygen is plentiful, butane burns to form carbon dioxide and water vapor; when oxygen is limited, carbon (soot) or carbon monoxide may also be formed. 2C4H10

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