• A troy ounce is480 grains an avoirdupois ounce is 437.5 grains
  • Troy weight From Wikipedia, the free encyclopedia Jump to: navigation, search Troy weight is a system of units of mass customarily used for precious metals, black powder, and gemstones. Contents [hide] Regular ounce? There is no such thing as a regular ounce. A fluid ounce is a unit of volume. There are 16 fluid ounces (US) to the pint (US). A dry ounce is a unit of weight. There are 16 dry ounces to the pound. Frequently, the words fluid and dry are omitted. You have to know whether you're talking about volume or dry weight.

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