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troy ounce

Version date:2013-02-22


en-INapothecaries ounce
en-INtroy ounce
nl-NLApothekers ons
nl-NLtroy ounce



troy ounce or apothecaries ounce
1 troy ounce = 480 gr (exactly) = 31.1034768 g (exactly)
[ISO 31-03:1992.3-01.B.f]

The ounce (abbreviated: oz, the old Italian word onza, now spelled oncia; apothecary symbol: ?) is a unit of mass in a number of different systems, including various systems of mass that form part of the imperial and United States customary systems. Its size can vary from system to system. The most commonly used ounces today are the international avoirdupois ounce and the international troy ounce. (...) - International avoirdupois ounce The avoirdupois ounce is the most commonly used ounce today. It is defined to be one sixteenth of an avoirdupois pound. It is therefore equal to 437.5 grains. In 1958 the United States and countries of the Commonwealth of Nations agreed to define the international avoirdupois pound to be exactly 0.45359237 kilograms. Consequently, since 1958, the international avoirdupois ounce is exactly 28.349523125 grams by definition. The ounce is commonly used as a unit of mass in the United States. While imperial units have been officially abolished in the United Kingdom, the ounce remains a familiar unit, especially amongst older people. - International troy ounce A troy ounce (abbreviated as t oz) is equal to 480 grains. Consequently, the international troy ounce is equal to exactly 31.1034768 grams. There are 12 troy ounces in the now obsolete troy pound. Today, the troy ounce is used only to express the mass of precious metals such as gold, platinum or silver. For historical measurement of gold, - a fine ounce is a troy ounce of 99.5% ('.995') pure gold - a standard ounce is a troy ounce of 22 carat gold, 91.66% pure (11 'fine ounces' plus one ounce of alloy material)
[Wikipedia (En)]