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The table of imperial avoirdupois mass is the same as the United States table up to one pound, but above that point, the tables differ. The imperial system has a hundredweight, defined as eight stone of 14 lb each, or 112 lb ( 50.802 345 44 kg ), whereas a US hundredweight is 100 lb ( 45.359 237 kg ).
The apothecaries and troy pounds are divided into 12 ounces (of 480 grains) while the avoirdupois pound has 16 ounces (of 437.5 grains). The unit of volume, the gallon , has different values in the United States and in the United Kingdom – the US fluid gallon being about 0.83 imperial gallons and the US dry gallon being about 0.97 imperial ...
Before that time, various sorts of troy ounces were in use on the continent. [8] The troy ounce and grain were also part of the apothecaries' system. This was long used in medicine, but has been largely replaced by the metric system (milligrams). [11] The only troy weight in widespread use is the British Imperial troy ounce and its American ...
The avoirdupois system served as the general system of mass and weight. In addition to this, there are the troy and the apothecaries' systems. Troy weight was customarily used for precious metals, black powder, and gemstones. The troy ounce is the only unit of the system in current use; it is used for precious metals. Although the troy ounce is ...
Avoirdupois is a system of mass based on a pound of 16 ounces, while Troy weight is the system of mass where 12 troy ounces equals one troy pound. The symbol g 0 is used to denote standard gravity in order to avoid confusion with the (upright) g symbol for gram.
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The troy ounce is heavier than the avoirdupois ounce, a commonly used unit for measuring weight in the United States customary system. [ 5 ] The standard gold bar held and traded internationally by central banks and bullion dealers is the Good Delivery bar with a 400 ozt (12.4 kg; 27.4 lb) nominal weight.
The convention in these articles was to use the statutory rate to translate troy ounces to dollars. I have used these conversion rates to translate back to troy ounces. Before January, 1934 the conversion rate was $20.67/oz. Afterwards It was $35/oz until 1972.