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Excerpt from Notes on Heating and Ventilation
Work is measured in foot-pounds. The unit of work is the work required to raise one pound through a height of one foot. Ten units of work or ten foot pounds would be the amount of work done in raising ten pounds One foot high or one pound ten feet high. Heat is a form of motion, hence there must be some definite relation between heat and work. This relation was first determined by Joule. By a series of experiments Joule found that one heat unit was equivalent to 778 foot-pounds. It is possible, then, to express heat either in heat units or in foot-pounds.
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