For example cooking and the postal system are in Av ounces Use troy ounce for precious metals 20 dwt pennyweight 1 troy oz 311 grams 1 troy oz 480 grains 1 troy oz 12 troy oz 1 troy lb 1 dwt pennyweight 1555 grams 14583 troy ounces 1 Avoirdupo ID: 59415
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