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An imperial fluid ounce is 1 ⁄ 20 of an imperial pint, 1 ⁄ 160 of an imperial gallon or exactly 28.4130625 mL. A US customary fluid ounce is 1 ⁄ 16 of a US liquid pint and 1 ⁄ 128 of a US liquid gallon or exactly 29.5735295625 mL, making it about 4.08% larger than the imperial fluid ounce. A US food labeling fluid ounce is exactly 30 mL.
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.
[1] [2] [3] It may be that all English-unit derived capacity measurements are derived from one original approximate measurement: the mouthful, consisting of about 1 ⁄ 2 ounce, called the ro in ancient Egypt (their smallest recognized unit of capacity). [4] [5] The mouthful was still a unit of liquid measure during Elizabethan times. [6]
One litre of water has a mass of almost exactly one kilogram when measured at its maximal density, which occurs at about 4 °C. It follows, therefore, that 1000th of a litre, known as one millilitre (1 mL), of water has a mass of about 1 g; 1000 litres of water has a mass of about 1000 kg (1 tonne or megagram). This relationship holds because ...
Half of a gill is a jack, or one-eighth of a pint. [1] But in northern England, a quarter pint could also be called a jack or a noggin, rather than a gill, and in some areas a half-pint could be called a gill, particularly for beer and milk. [2] [3] [4] In Scotland, there were additional sizes: [5] big gill = 1 + 1 ⁄ 2 gills (213.1 mL)
A sixth (1 ⁄ 6, or 0.166) of a US Gallon, rounded up from its actual volume of 21.33 US fl oz. Formerly used for cheap liquor like gin and vodka. It was supposed to be replaced by the 500 mL "half-liter", which was dropped in 1989, but is sometimes used for craft beer and malt liquor. Fifth (US) 25.6 US fl oz: 26.66 imp oz. 757 mL
The troy ounce is the only unit of the system in current use; it is used for precious metals. Although the troy ounce is larger than its avoirdupois equivalent, the pound is smaller. The obsolete troy pound was divided into 12 ounces, rather than the 16 ounces per pound of the avoirdupois system.
US dry barrel: 7,056 cubic inches (115.6 litres; 3.3 US bushels) . Defined as length of stave 28 + 1 ⁄ 2 in (72 cm), diameter of head 17 + 1 ⁄ 8 in (43 cm), distance between heads 26 in (66 cm), circumference of bulge 64 in (160 cm) outside measurement; representing as nearly as possible 7,056 cubic inches; and the thickness of staves not greater than 4 ⁄ 10 in (10 mm) [2] (diameter ≈ ...