The
British thermal unit is a nonmetric unit of
heat, used in the United States and the UK. The metric unit is the
joule, which is used by most other countries. 1 Btu is defined by the amount of heat required to raise the temperature of one pound of water from 63
oF to 64
oF.
1 Btu is approximately 252.0 calories, 778 ft·lb, or 1055 J.
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