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The pound avoirdupois is the weight system used in the united states based on 16 ounces. Avoirdupois pound is exactly 0.45359237 kgs.
Troy weight is based on 12 ounce pounds and is used primarily for precious metals. The ounce is actually heavier than the avoirdupois ounce, the troy ounce is 480 grains, compared with the avoirdupois ounce, which is 4371?2grains. Both systems use the same grain defined by the international yard and pound agreement of 1959 as exactly 0.064 798 91 gram.
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