Troy ounce

The troy ounce (ozt) is a unit of imperial measure. In the present day it is most commonly used to gauge the weight and therefore the price of precious metals. One troy ounce is equivalent to 31.1034768 grams.

The troy ounce is part of the troy weights system derived from the Roman monetary system. The Romans used bronze bars of varying weights as currency. An aes grave weighed equal to 1 pound. One twelfth of an aes grave was called an uncia, or in English an "ounce". Later standardization would change the ounce to 1/16 of a pound (the avoirdupois ounce), but the troy ounce, which is 1/12 of a troy pound (note that a troy pound is lighter than an avoirdupois pound), has been retained for the measure of precious metals. At 480 grains, the troy ounce is heavier than the avoirdupois ounce, which weighs 437.5 grains. A grain is 64.7989 milligrams (mg); hence one troy ounce is 31.1034768 grams (g) (exact by definition), about 10 percent more than the avoirdupois ounce, which is 28.349523125 g (exact).12

To maintain purity standards and common measures across time, the troy ounce was retained over the avoirdupois ounce in the weighing and pricing of gold, platinum, silver and gunpowder. Likewise, the grain, identical in both the troy and avoirdupois systems, is still used to measure arrow and arrowhead weights in archery along with bullets and powder weights in ballistics. The troy ounce and grain were also common to the apothecaries' system long used in medicine, but have been largely replaced by milligrams.3

References ^ "Troy Ounce". Troy Ounce: What is a Troy Ounce?. http://www.troy-ounce.com/. Retrieved 2009-08-31.  ^ "Statutory Instrument 1994 No. 2867: The Units of Measurement Regulations 1994". http://www.opsi.gov.uk/si/si1994/uksi_19942867_en_1. Retrieved 2010-01-10.  ^ "Troy Ounce". WordNet 3.0, Dictionary.com. Princeton University. http://dictionary.reference.com/browse/troy%20ounce. Retrieved 2008-01-10. 

ø Troy Ounce - What Is A Troy Ounce? ø
Important! - A Troy Ounce is not the same as an Avoirdupois Ounce! Make sure you know your facts before buying or selling gold and silver!
www.troy-ounce.com

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troy weight: Definition from Answers.com
troy weight n. A system of units of weight in which the grain is the same as in the avoirdupois system and the pound contains 12 ounces, 240
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Decimal tables used at the Bank of England for reducing the gross weight of gold and silver to standard according to the assay reports: To which is prefixed ... ounce as the standard or unit of Troy weight Wilson

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Troy Ounce
Originally used in Troyes, France, the troy ounce was used when dealing with ... The troy ounce is the only measure of the troy weighting system that is still used in ...
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Troy ounce: Definition from Answers.com
Troy Ounce A unit of measure for weight that dates back to the Middle Ages. Originally used in Troyes, France, the troy ounce was used when dealing
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