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An imperial fluid ounce is defined in British law as 28.4130625 millilitres, a US customary fluid ounce is 29.57353 mL, and a US food labelling fluid ounce is 30 mL. The fluid ounce is sometimes referred to simply as an "ounce" in contexts where its use is implicit, such as bartending. Other uses Fabric weight. Ounces are also used to express ...
The US fluid ounce is based on the US gallon, which in turn is based on the wine gallon of 231 cubic inches that was used in the United Kingdom prior to 1824. With the adoption of the international inch, the US fluid ounce became 1⁄128 gal × 231 in 3 /gal × (2.54 cm/in) 3 = 29.5735295625 mL exactly, or about 4% larger than the imperial unit.
59 to 89 ml (2 to 3 US fl oz) There is no official size for a single shot, except in Utah, where a shot is defined as 1.5 US fl oz (44.4 ml). Elsewhere in the U.S., the standard size is generally considered to be 1.25–1.5 US fl oz (37–44 ml). A double shot in the U.S. may be 2 US fl oz (59.1 ml) or more. However in most of the U.S. 1.5 US ...
An ounce consisted of 437.5 grains, thus making the dram approximately 27.34 grains. drachm now meant only apothecaries' drachms, which were 1 ⁄ 8 of an apothecaries' ounce of 480 grains, thus equal to 60 grains. Modern unit of mass. In the avoirdupois system, the dram is the mass of 1 ⁄ 256 pound or 1 ⁄ 16 ounce.:
In Canada, a teaspoon is historically 1⁄6 imperial fluid ounce (4.74 mL) and a tablespoon is 1⁄2 imperial fl oz (14.21 mL). In both Britain and Canada, cooking utensils come in 5 mL for teaspoons and 15 mL for tablespoons, hence why it is labelled as that on the chart. The volumetric measures here are for comparison only.
The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1 ⁄ 6, 1 ⁄ 2, and 8 fluid ounces respectively. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, [citation needed] but in the US it is defined as 1 ⁄ 128 of a US gallon. Consequently, a fluid ounce of water weighs ...
The minim was defined as one 60th of a fluid dram or one 480th of a fluid ounce. This is equal to about 61.6 μL (U.S.) or 59.2 μL (Britain). Pharmacists have since moved to metric measurements, with a drop being rounded to exactly 0.05 mL (50 μL, that is, 20 drops per milliliter).
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