Encyclopedia > Troy ounce

  Article Content

Troy ounce

The troy ounce is the traditional unit of mass for precious metals. It derives from the troy system of mass[?], which dates back to before the time of William the Conqueror. Its name is thought to derive from the town of Troyes in France. 1 troy ounce is defined as exactly 480 grains, where 1 grain is exactly 64.79891 milligrams, hence 1 troy ounce is exactly 31.1034768 grams.

The symbol for ounce is ℥

Note: The troy ounce is about 10% more than the more common ounce defined by the avoirdupois system of mass, which is 28.3 g. There are also two versions of the fluid ounce[?], units of volume, of 28.4 and 29.6 ml.

See also Conversion of units.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Anna Karenina

... Moscow to mediate the marital discord of her brother Stepan (Stiva) Oblonsky and his wife Darya (Dolly) caused by the former's unfaithfulness. In Moscow, Anna meets and ...

This page was created in 23.5 ms