British thermal unit

British thermal unit

n. Abbr. BTU or 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.

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British thermal unit  (brtsh)

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.

Thesaurus

Noun

1.

British thermal unit - a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories B.Th.U., BTU energy unit, heat unit, work unit - a unit of measurement for work therm - a unit of heat equal to 100,000 British thermal units