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Troy weight is a system of units of mass that originated in 15th-century Kingdom of England [1] and is primarily used in the precious metals industry. The troy weight units are the grain, the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces).
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Wikipedia - Troy weight - Wikipedia
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Unidades de medida. La libra troy (troy) contiene 5,760 granos (≈ 373.24 gramos, 12 ozt), mientras que una libra avoirdupois es ≈ 21,53% más pesada y equivale a 7.000 granos (≈ 453,59 gr). Una onza troy (ozt) equivale a 31.1034768 gramos.
troy weight, traditional system of weight in the British Isles based on the grain, pennyweight (24 grains), ounce (20 pennyweights), and pound (12 ounces). The troy grain, pennyweight, and ounce have been used since the Middle Ages to weigh gold, silver, and other precious metals and stones.
- The Editors of Encyclopaedia Britannica
A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and apothecaries' systems, equal to exactly 64.798 91 milligrams. It is nominally based upon the mass of a single ideal seed of a cereal .
A troy pound (abbreviated lb t) is equal to 12 troy ounces and to 5,760 grains, that is exactly 373.241 7216 grams. Troy weights were used in England by jewellers. Apothecaries also used the troy pound and ounce, but added the drachms and scruples unit in the Apothecaries' system of weights.
El peso troy es un sistema de unidades de masa utilizado habitualmente para metales preciosos, piedras preciosas y pólvora. El nombre procede de Troyes, Francia, pues se sabe que el sistema troy de pesos se usaba allí en la época medieval, en la feria celebrada en Troyes, en el noreste de Francia.
