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B.T.U.

1889 as an abbreviation of British Thermal Unit (1862), a commercial unit of electrical energy (the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit); the French Thermal Unit is the amount of heat required to raise 1 kilogram of water 1 degree centigrade. Also from 1889 as an abbreviation of Board of Trade Unit, in electicity "1,000 watt hours."

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Definitions of B.T.U.

B.T.U. (n.)
a unit of energy equal to the work done by a power of 1000 watts operating for one hour;
Synonyms: kilowatt hour / kW-hr / Board of Trade unit
From wordnet.princeton.edu

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