Wikipedia: History of British thermal unit

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The British thermal unit is a unit of heat. 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.

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.

Changed: 3c3

1 Btu is approximately 252.0 calories, 778 ft·lb, or 1055 J.

	Revision 2 . . October 26, 2001 9:22 am by (logged).111.13.xxx [mention BTU as nonmetric unit used in US & UK]
	Revision 1 . . October 26, 2001 8:30 am by (logged).123.179.xxx *[new stub, needs history.]**