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One-troy-ounce (480 gr; 31 g) samples of germanium, iron, aluminium, rhenium and osmium A Good Delivery silver bar weighing 1,000 troy ounces (83 troy pounds; 31 kg) Troy weight is a system of units of mass that originated in the Kingdom of England in the 15th century [1] and is primarily used in the precious metals industry.
See Weight for detail of mass/weight distinction and conversion. 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.
In both supermarkets and steakhouses, cuts of meat are sold in ounces and pounds. Loosely sold goods need not carry a unit conversion. Tomatoes being sold by the pound in a ShopRite store in New Jersey Sample U.S. Nutrition Facts label. In some agricultural areas, pecks or bushels can denote quantities of apples etc. by dry volume.
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American cooks using British recipes, and vice versa, need to be careful with pints and fluid ounces. A US pint (16 US fluid ounces) is about 16·65 UK fluid ounces or 473 mL, while a UK pint is 20 UK fluid ounces (about 19·21 US fluid ounces or 568 mL): a UK pint is, therefore, about 20% larger than a US pint.
Troy weight, avoirdupois weight, and apothecaries' weight are all built from the same basic unit, the grain, which is the same in all three systems. However, while each system has some overlap in the names of their units of measure (all have ounces and pounds), the relationship between the grain and these other units within each system varies.
Another difference arose when Britain abolished the troy pound (373.241 7216 g) on 1 January 1879, leaving only the troy ounce (31.103 4768 g) and its decimal subdivisions, whereas the troy pound (of 12 troy ounces) and pennyweight are still legal in the United States, although they are no longer widely used.
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 ...