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The troy ounce is the only ounce used in the pricing of precious metals, such as gold, platinum, and silver.
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In troy weight, there are 12 ounces in a pound,
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A troy pound is 5760 grains (about 373.24 g, 12 troy ounces).
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The standard troy was adopted as being the weight of a cubic inch of distilled water, 252.458 grains, when the temperature was 62 degrees Fahrenheit and the barometric pressure 30 inches. (Wightman's Arithmetical Tables). Today the grain is 64.79891 milligrams but the grain in 1758 was the weight of a seed from the middle of an ear of barley.
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