gaz naturel liquéfié, GNL
natural gas, largely composed of methane, which has been refrigerated to a liquid. The boiling point of methane at atmospheric pressure is -161°C. Because of its low critical point, it must be cooled to below this temperature before it can be liquefied by pressure. Once liquefied, it can be stored in well-insulated vessels and can be conveniently transported. It is used as an engine fuel.
