# 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 ?
The administration tax plan proposes significant tax increases for businesses through higher rates, repeal of certain deductions, and the new BTU energy tax.
Spot prices traded at \$7.70/m BTU earlier in March, up from the record low of \$6.70 in the first half of February.
Of the brand's 29 models from 5,000 to 28,500 BTUs, 10 are Energy Star.
Under the administration plan, the BTU tax would be collected at the source--except for coal.
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.
Having dropped the certification this year as it met the upgraded energy standards, GE has seven Energy Star models rated at 10.7 and 10.8 EER from 5,000 to 18,000 BTUs with electronic and remote controls.
A Saudi domestic gas selling price to \$1.50/m BTUs will be a level high enough to make firms think harder about conserving gas, but not so high as to make a big dent in their earnings.
Most of the extensive line from 5,000 to 24,000 BTUs, including casements and sliders, met the 2001 energy regulations in 2000.
The Holiday portable unit -- 6,000 BTUs and one quart of water removal an hour -- has an automatic thermostat.
The low-profile at 6,100 BTUs is back with White-Westinghouse and Frigidaire labels.
The line spans from 5,000 to 21,000 BTUs, plus a heat-pump unit.
The Ridgefield Park, N.J., company also unveiled six models of room air conditioners from 5,000 to 18,000 BTUs.

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