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The troy ounce (oz t) is a unit of imperial measure, now commonly only used for the mass (weight, in common parlance) of precious metals. One troy ounce is now defined as exactly 31.1034768 g. The troy ounce is about 10% heavier (ratio 192/175) than the avoirdupois ounce which equals 28.349523125 g.
(1 avoirdupois ounce = 28.35 grams, a troy ounce = 31.1 grams). A troy pound is lighter than a avoirdupois pound because it contains fewer ounces. (Troy pound contains 12 troy ounces, avoirdupois pound contains 16 avoirdupois ounces.