Celsius heat unit

Celsius heat unit
(Chu)
   a unit of heat energy equal to the energy required to raise the temperature of one pound of water by 1°C at standard atmospheric pressure. 1 Chu is equal to exactly 1.8 Btu, approximately 453.59 IT calories (see above), or 1.8991 kilojoules. The unit is also called the centigrade heat unit.

Dictionary of units of measurement. 2015.

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