"n-butane"n-butane has a boiling point of 11 ""^@C∘C. It is commonly supplied in canisters (sometimes small ones), with some quantities of isomeric "methylpropane"methylpropane. "Butane"Butane with "propane"propane is a constituent of "LPG, liquefied petroleum gas"LPG, liquefied petroleum gas. The short carbon chain makes it very clean burning. Of course for this reason it is a potent greenhouse gas.