Today, the troy ounce is used only to express the mass of precious metals such as gold, platinum, palladium, rhodium or silver. There are 12 troy ounces in the now obsolete troy pound. Consequently, the international troy ounce is equal to exactly 31.1034768 grams. In the United Kingdom it ceased to be an independent unit of measure in 2000, but may still be seen as an (imprecise) indicator of portion sizes in burger and steak restaurants.Ī troy ounce (abbreviated oz t) is equal to 480 grains. The ounce is still a standard unit in the United States. In the avoirdupois system, sixteen ounces make up an avoirdupois pound, and the avoirdupois pound is defined as 7000 grains one avoirdupois ounce is therefore equal to 437.5 grains. ![]() The international avoirdupois ounce (abbreviated oz) is defined as exactly 28.349523125 g under the international yard and pound agreement of 1959, signed by the United States and countries of the Commonwealth of Nations. Historically, in different parts of the world, at different points in time, and for different applications, the ounce (or its translation) has referred to broadly similar but still slightly different standards of mass.Ĭurrently in use International avoirdupois ounce The abbreviation oz came later from the Italian cognate onza, pronounced (now oncia, pronounced ). The term uncia was borrowed twice: first into Old English as ynsan or yndsan from an unattested Vulgar Latin form with ts for c before i ( palatalization), which survives in modern English as inch, and a second time into Middle English through Anglo-Norman and Middle French ( unce, once, ounce), yielding English ounce. This in turn comes from Latin uno ('one'), and thus originally meant simply 'unit'. Ounce derives from the Ancient Roman uncia, a unit in the Ancient Roman units of measurement weighing about 27.35 grams or 0.967 of an Avoirdupois ounce, that was one-twelfth ( 1⁄ 12) of the Roman pound ( libra). Historically, a variety of different ounces measuring mass or volume were used in different jurisdictions by different trades and at different times in history. The fluid ounce is a measure of volume. ![]() ![]()
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