| 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, odorless, easily liquefied gases. The name butane comes from the roots but- and -ane. Image:Butane-2D-Skeletal.svg|n-Butane Image:I-Butane-2D-Skeletal.svg|Isobutane Reactions and us… (More on N-butane)