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Jan8-13, 02:28 PM
At one time, the metric measure for heat was the calorie, whilst the unit for work was the joule. Today we measure it all in joules.
And if it was an old American textbook, it might be using Brithsh Thermal Units and horsepower...
It's mich simpler to use SI units, and measure both heat and work in the same units (joules).