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[hawrs-pou-er-ouuh r, -ou-er] /ˈhɔrsˌpaʊ ərˌaʊər, -ˌaʊ ər/

a foot-pound-second unit of energy or work, equal to the work done by a mechanism with a power output of one horsepower over a period of one hour.
an fps unit of work or energy equal to the work done by 1 horsepower in 1 hour. 1 horsepower-hour is equivalent to 2.686 × 106 joules


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