Troy weight
Troy weight
Troy weight is a system of units of mass that originated in 15th-century England, and is primarily used today in the precious metals industry. Its units are the grain, troy ounce, and troy pound. The troy ounce is more commonly used than the troy pound.
Pronunciation
Troy weight is pronounced as /trɔɪ weɪt/.
Etymology
The term "Troy weight" originated from the city of Troyes, France, where the system was first used in the Middle Ages. The word "weight" comes from the Old English "gewiht", meaning a measure of weight.
Units
The basic units of troy weight are:
- Grain: The smallest unit in the troy weight system. It is equivalent to approximately 64.79891 milligrams.
- Troy ounce: A unit of troy weight equal to 480 grains, or approximately 31.1034768 grams.
- Troy pound: A unit of troy weight equal to 12 troy ounces, or approximately 373.2417216 grams.
Related terms
- Avoirdupois weight: A system of weights (or, properly, mass) based on a pound of 16 ounces. It is the everyday system of weight used in the United States and is used for most goods other than precious metals, gems, and drugs.
- Pennyweight: A unit of troy weight. It is the equivalent of 24 grains or 1/20th of a troy ounce.
- Troyes: The city in France where the troy weight system originated.
External links
- Medical encyclopedia article on Troy weight
- Wikipedia's article - Troy weight
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