#"n-butane"# has a boiling point of #1# #""^@C#. It is commonly supplied in canisters (sometimes small ones), with some quantities of isomeric #"methylpropane"#. #"Butane"# with #"propane"# is a constituent of #"LPG, liquefied petroleum gas"#. The short carbon chain makes it very clean burning. Of course for this reason it is a potent greenhouse gas.