# British thermal unit

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## British thermal unit,

abbr. Btu, unit for measuring heat quantity in the customary system of English units of measurementEnglish units of measurement,
principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S.
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, equal to the amount of heat required to raise the temperature of one pound of water at its maximum density [which occurs at a temperature of 39.1 degrees Fahrenheit (°F;) ] by 1°F;. The Btu may also be defined for the temperature difference between 59°F; and 60°F;. One Btu is approximately equivalent to the following: 251.9 calories; 778.26 foot-pounds; 1055 joules; 107.5 kilogram-meters; 0.0002928 kilowatt-hours. A pound (0.454 kilogram) of good coal when burned should yield 14,000 to 15,000 Btu; a pound of gasoline or other fuel oil, approximately 19,000 Btu.

## British thermal unit

(BTU)
The amount of heat required to raise one pound of water 1 degree Fahrenheit in temperature—about the heat content of one wooden kitchen match.

## British thermal unit

[′brid·ish ′thər·məl ‚yü·nət]
(thermodynamics)
Abbreviated Btu.
A unit of heat energy equal to the heat needed to raise the temperature of 1 pound of air-free water from 60° to 61°F at a constant pressure of 1 standard atmosphere; it is found experimentally to be equal to 1054.5 joules. Also known as sixty degrees Fahrenheit British thermal unit (Btu60/61).
A unit of heat energy that is equal to 1/180 of the heat needed to raise 1 pound of air-free water from 32°F (0°C) to 212°F (100°C) at a constant pressure of 1 standard atmosphere; it is found experimentally to be equal to 1055.79 joules. Also known as mean British thermal unit (Btumean).
A unit of heat energy whose magnitude is such that 1 British thermal unit per pound equals 2326 joules per kilogram; it is equal to exactly 1055.05585262 joules. Also known as international table British thermal unit (BtuIT).

## British thermal unit

The amount of heat required to raise the temperature of 1 pound of water by 1 degree Fahrenheit. Abbr. Btu.
References in periodicals archive ?
Capacities still are 5,000 to 21,000 BTUs, but now there are two units in most sizes to hit high and higher EERs.
The added cost would be small, about 2 cents per million BTUs " acknowledges Ronald McMahan, an analyst for Resource Data International in Boulder, Colorado.
Under the administration plan, the BTU tax would be collected at the source--except for coal.
Of the brand's 29 models from 5,000 to 28,500 BTUs, 10 are Energy Star.
Danby's line spans from 5,000 to 18,000 BTUs, most with electronic controls, three-speed fan and cool, slideout chassis and oscillating air swing.
There's a redesigned chassis for all machines 15,000 BTUs and larger, with better air flow and more attractive controls.
Most of the extensive line from 5,000 to 24,000 BTUs, including casements and sliders, met the 2001 energy regulations in 2000.
The line will be from 9,000 to 24,000 BTUs, with new chassis on mid-sized models.
There are 27 White-Westinghouse models from 5,000 to 28,500 BTUs, plus four dehumidifiers.

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