British thermal unit

English

Noun

British thermal unit (plural British thermal units)

  2. 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

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