Troy weight
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Troy weight is a system of units of mass whose origin is uncertain. By far the most common troy unit is the troy ounce, the standard mass unit for precious metals in industry and in trade; it equals 3
Troy ounce is a traditional unit of gold – this sample marked "999,9" is four nines fine (see: Fineness § Gold), meaning it is pure to 999.9 parts in 1,000 (i.e.99.99% pure)
One troy ounce (480 grains; 31 grams) samples of germanium, iron, aluminium, rhenium and osmium. The differences in size are due to differences in density.
The standard British troy pound manufactured in 1758; it bears the abbreviation ℔ ("pound") and the letter "T" for troy.
Ounce
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The ounce is any of several different units of mass, weight, or volume and is derived almost unchanged from the uncia, an Ancient Roman unit of measurement.
Droste's Instant Cocoa with a net weight of 8 ounces
