In the late 19ᵗʰ —early 20ᵗʰ centuries, the quantity of energy 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. One pound-calorie is about 453.6 calories or 1.8 BTU.

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