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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.
Also the troy pound is the equivalent of 12 troy ounces, whereas the avoirdupois pound is the equivalent of 16 avoirdupois ounces. One troy ounce is approximately 31.1 grams; one troy pound is 373.24 grams.