bthu

British thermal unit

noun Physics.
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.

Origin:
1875–80

Dictionary.com Unabridged

B.T.U.

Physics.
British thermal unit; British thermal units.
Also, BTU, B.t.u., B.th.u., Btu.
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World English Dictionary
British thermal unit
 
n
btu, Abbrevs: BThU 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

btu or BThU
 
abbreviation for
US abbreviation: BTU British thermal unit
 
BThU or BThU
 
abbreviation for

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American Heritage
Medical Dictionary

British thermal unit n.
Abbr. Btu

  1. The quantity of heat required to raise the temperature of one pound of water from 60° to 61°F at a constant pressure of one atmosphere.

  2. The quantity of heat equal to 1/180 of the heat required to raise the temperature of one pound of water from 32° to 212°F at a constant pressure of one atmosphere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
British thermal unit   (brĭt'ĭsh)  Pronunciation Key 
A unit used mainly to measure heat but also applied to other forms of energy. One British thermal unit is equal to the amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit, or 251.997 calories.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
British thermal unit (Btu)

A unit for measuring heat. One Btu raises the temperature of one pound of water one degree Fahrenheit.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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