Liquefied petroleum gas
Propane and butane are volatile and gaseous at room temperature, but are transported as liquids in fully-refrigerated tanks at close to atmospheric pressure.
Propane (C3H8) goes to the liquefied petroleum gas (LPG) market for heating, lighting, cooking and as motor fuel. Propane has also been used widely as a chemical feedstock for making ethylene and propylene.
Butane (C4H10) goes to gasoline blenders or refiners as raw material, or to chemical plants as feedstocks. In some places, butanes are used together with propane as LPG.