British Thermal Unit

The amount of heat required to raise the temperature of 1 lb of water by 1 degree Fahrenheit. Normally taken as 60° to 61°F.
1 Btu=1055.06 J 1 Btu=252 calories
1 Btu=778.2 ft lbf 1 therm=1x105 Btu
1 Btu=2.928 x10-4 kWh 1 J=1 Nm

In America the British thermal unit is sometimes called the heat unit.

See also: Q unit, Therm.

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Subjects: Heating Ventilation and Air Conditioning Units