Troy weight is a system of units of mass customarily used for precious metals, black powder, and gemstones.
Named after Troyes, France, the troy system of weights was known to exist in medieval times, at the celebrated fair at Troyes in North Eastern France.
One cubic inch of distilled water, at 62 °F (17 °C), and at a barometric pressure of 30 inches f mercury, was determined to weigh 252.458 troy grains
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