A unit used to express the size of a heat flow, 19th and 20th centuries. Symbol, “Chu”. This unit was sometimes called the pound centigrade unit, symbol “Pcu”.
“The quantity of heat required to increase the temperature of one pound of water 1 degree Centigrade at atmospheric pressure; approximately 454 gramcalories.”¹
1. National Research Council.
A Glossary of Terms in Nuclear Science and Technology.
New York: American Society of Mechanical Engineers, 1955.
Pages 29-30, 118.
“...in the proportions of 1,390 footpounds for each centigrade heat unit, a heat unit being the amount of heat necessary to heat one pound weight of water through 1° C.”
The Gas Engine. Third edition.
New York: John Wiley and Sons, 1890.
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