A hydrocarbon fuel, C4H10, which is a gas at ordinary temperatures and atmospheric pressure. It has a boiling point of 1 degree C at atmospheric pressure and may therefore not be used in colder climates as a gaseous fuel.
Note: Butane is commercially available under various names.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Celsius (previously Centigrade)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM