British thermal unit

== English == === Noun === British thermal unit (plural British thermal units) A unit of energy that is equivalent to the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature (there are several different precise definitions) and a pressure of one atmosphere. Alternative forms: BTU, Btu (symbols) Hypernym: unit Coordinate terms: (other non-SI units of energy) calorie, Calorie, ton of TNT; (SI unit of energy) joule, J ==== Translations ==== ==== See also ====