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The fluid ounce is distinct from the (international avoirdupois) ounce as a unit of weight or mass, although it is sometimes referred to simply as an "ounce" where context makes the meaning clear (e.g., "ounces in a bottle"). A volume of pure water measuring one imperial fluid ounce has a mass of almost exactly one ounce.
In 1901, at the 3rd CGPM conference, the litre was redefined as the space occupied by 1 kg of pure water at the temperature of its maximum density (3.98 °C) under a pressure of 1 atm. This made the litre equal to about 1.000 028 dm 3 (earlier reference works usually put it at 1.000 027 dm 3).
[a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b], then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.42 cu in), the imperial gallon is 1.62% smaller than the pre-1824 ale gallon.
As an imperial fluid ounce is 96.076% of a US fluid ounce, this means that one imperial gallon, quart, pint, cup and gill are all equal to 1.20095 of their US counterparts. Historically, a common bottle size for liquor in the US was the "fifth", i.e. one-fifth of a US gallon (or 0.08% more than a "reputed quart", one-sixth of an imperial gallon ...
Thirty years later in 1824, the imperial gallon was defined to be the volume occupied by ten pounds of water at 17 °C (62 °F). [5]: 394 This definition was further refined until the United Kingdom's Weights and Measures Act 1985, which makes 1 imperial gallon precisely equal to 4.54609 litres with no use of water. [11]
In the apothecaries' system, which was widely used in the United States until the middle of the 20th century, [15] the dram is the mass of 1 ⁄ 96 pounds apothecaries (lb ap), or 1 ⁄ 8 ounces apothecaries (oz ap or ℥) [5]: C-7 (the pound apothecaries and ounce apothecaries are equal to the troy pound (lb t), and troy ounce (oz t ...
A metric fifth of Dewar's Scotch whisky. A fifth is a unit of volume formerly used for wine and distilled beverages in the United States, equal to one fifth of a US liquid gallon, or 25 + 3 ⁄ 5 U.S. fluid ounces (757 milliliters); it has been superseded by the metric bottle size of 750 mL, [1] sometimes called a metric fifth, which is the standard capacity of wine bottles worldwide and is ...
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 ≈ ...