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, pennyweight (24 grains), troy ounce (20 pennyweights), and troy pound (12 troy ounces). The troy ounce and grain were also part of the apothecaries' system.

History

The troy weight system is believed to have been introduced into England in the 15th century through trade with the Hanseatic League. The system was originally used for weighing precious metals, gemstones, and black powder. It was later adopted by the apothecaries for use in the pharmaceutical industry.

Units

The basic unit of troy weight is the grain. 24 grains make up a pennyweight, 20 pennyweights make up a troy ounce, and 12 troy ounces make up a troy pound. The troy ounce is approximately 10% heavier than a typical ounce, while the troy pound is lighter than a typical pound.

Usage

Today, the troy weight system is primarily used in the precious metals industry. The prices of gold, silver, and other precious metals are typically quoted in troy ounces. The system is also used in the pharmaceutical industry, where the grain is used to weigh ingredients for medications.

See also

• Avoirdupois system
• Apothecaries' system
• International System of Units

References

Troy weight Resources
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