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The pound is a unit of the United States customary system, used both to measure mass and force (or weight). As a mass unit, it is comparable to the kilogram of the International System of Units, but it is also used as a unit of force or weight, in which case it is defined as the force with which the specified mass is attracted by the earth. It is actually more commonly considered as a force unit than as a mass unit.

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Pound-forceEdit