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|1 BTU in ...||... is equal to ...|
|SI units||1055.1 J
|Imperial/US unit(s)||778.79 ft.lbf
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The British thermal unit (Btu or BTU) is a traditional unit of heat; it is defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.
It is part of the British Imperial system of units. Its counterpart in the metric (SI) system is the calorie, which is defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius.
This article uses material from the Wikipedia article "British thermal unit", which is released under the Creative Commons Attribution-Share-Alike License 3.0.