In the late 19th—early 20th centuries, the quantity of heat need to raise the temperature of 1 pound of water from 15°C to 16°C. Abbr., lb.-cal. Used to express the heating value of coal, largely in American metallurgical industries. 1 pound-calorie is about 453.6 calories or 1.8 BTU.
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Last revised: 22 July 2002.