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Grain (gr - Avoirdupois (U.S.)), mass
A grain is a unit of mass equal to 0.06479891 gram, in the avoirdupois, Apothecaries' and troy weight systems. It is part of the Imperial system of weights and measures. An avoirdupois pound (i.e., the pound commonly abbreviated as lb in American usage) is 7000 grains, whereas a troy pound is 5760 grains.
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Avoirdupois (U.S.)
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