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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.
One troy ounce (abbreviated t oz or oz t) is equal to 31.103 4768 grams, (or about 1.0971 oz. avoirdupois, the avoirdupois ounce being the most common definition of an ounce in the US). There are only 12 troy ounces per troy pound, rather than the 16 ounces per pound found in the more common avoirdupois system.