# 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.
, 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 ?
Additions are its first portables, heat-cool and cool-only; a claimed smallest cabinet for an 8,000; a slider-casement with electronic controls; and heat-cool models at 18,000 and 25,000 BTUs.
Robert Byrd and White House Chief of Staff Thomas McLarty, a former natural-gas executive), oil would be taxed at 60 cents per million BTUs, while coal, gas, nuclear, and hydroelectric power would be taxed at 26 cents per million BTUs.
Congress is expected to begin working on the President's BTU energy tax soon after it returns from the Easter recess.
Portable air conditioners from 7,800 to 12,000 BTUs have added several models, including one with a dual water-cooled system that simultaneously dehumidifies.
Cooline retains its multifilter combination of antibacterial and charcoal filters, but is tweaking its electric heating and cooling between 9,000 and 24,000 BTUs.
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.
The Frigidaire brand has 14 air conditioners, 5,000 to 25,000 BTUs, and four dehumidifiers.
Compact models are the GAC053T7A, 5,200 BTUs and 8.
The supplier will offer just about every configuration of air conditioner in 1996: window units, slider-casements, through-the-wall and double-duty units from 5,000 to 32,000 BTUs.

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