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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. The troy weight units are the grain , the pennyweight (24 grains), the troy ounce (20 pennyweights), and the troy pound (12 troy ounces).
A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume. An imperial fluid ounce is defined in British law as 28.4130625 millilitres, [15] a US customary fluid ounce is 29.57353 mL, [16] and a US food labelling fluid ounce is 30 mL. [17]
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.
60 minims or 'drops' or 1 ⁄ 8 fluid ounce (fl oz). See also drachm. Teaspoon: 5 mL: 80 minim or drops or 1 ⁄ 6 fl oz Tablespoon: 15 mL: 4 dram (240 minim or drops), 3 teaspoons, or 1 ⁄ 2 fl oz Jack: 71 mL: 1 ⁄ 2 Gill. This is not a traditional measure. Gill: 142 mL: 1 ⁄ 4 pint, or 1 ⁄ 32 gallon, in some dialects 1 ⁄ 2 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.
Weight is measured in ounces and pounds (avoirdupois) as in the U.S. Volume is measured in imperial gallons , quarts , pints , fluid ounces , fluid drachms , and minims . The imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 litres in 1985.
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The confusing variety of definitions and conversions for pounds and ounces is covered elsewhere in a table of pound definitions. To unify all weight systems used by apothecaries, the Irish pharmacopœia of 1850 introduced a new variant of the apothecaries' system which subdivided a new apothecaries' pound of 12 avoirdupois ounces instead of the ...