Dictionary

British thermal unit

British thermal unit

noun

Definition of BRITISH THERMAL UNIT

:  the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a specified temperature (as 39°F)

First Known Use of BRITISH THERMAL UNIT

1876

British thermal unit

noun    (Medical Dictionary)

Medical Definition of BRITISH THERMAL UNIT

:  the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a specified temperature (as 39°F)—abbreviation Btu

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