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Definitions for Btu

[1] British thermal unit; British thermal units.
[2] the amount of heat required to raise the temperature of 1 pound (0.4 kg) of water 1°F. Abbreviation : Btu, BTU, B.t.u., B.T.U., B.th.u.
[3] British thermal unit US abbreviation: BTU
[4] Board of Trade Unit
[5] a unit of heat in the fps system equal to the quantity of heat required to raise the temperature of 1 pound of water by 1°F. 1 British thermal unit is equivalent to 1055.06 joules or 251.997 calories Abbrevs: btu , BThU

Origin of Btu

British thermal unitFirst recorded in 1875–80