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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.
Gill of Beer (UK) 284 mL: 9.6 US fl oz: 10 imp oz: 1 ⁄ 2 Imperial pint. A gill of beer was a customary measure equal to half an imperial pint (10 imperial fluid ounces or 280 millilitres) used in rural parts of England. [4] It is a holdover from when spirits, wines and brandies, ale, and beer all had different standard measures of capacity.
US fluid measures US dry measures Metric measures fluid ounces Imperial fluid ounce (fl oz) ≡ 1 imp fl oz. ≈ 0.960 759 940 40 US fl oz ≈ 0.947 102 083 33 US fl oz (food) ≡ 28.413 0625 mL ≡ 0.028 413 0625 L. US fluid ounce (customary) (fl oz) ≈ 1.040 842 730 79 imp fl oz. ≡ 1 US fl oz ≡ 0.985 784 318 75 US fl oz (food)
One should bear in mind that a pint in the UK is 20 imperial fluid ounces, whereas a pint in the US is 16 US fluid ounces. However, as 1 imperial fl. oz. ≈ 0.961 US fl. oz., this means 1 imperial pint ≈ 1.201 US pints (i.e. 0.961 × 20/16) instead of 1.25 US pints.
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.
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] The fluid ounce is sometimes referred to simply as an "ounce" in contexts where its use is implicit, such as bartending .
In 1995 the alcoholic drinks for consumption on the premises the 1 ⁄ 4, 1 ⁄ 5 and 1 ⁄ 6 gill measures for spirits (whisky, gin, rum and vodka) were replaced by 25 ml and 35 ml measures on 1 January 1995, [60] and wine can only be sold in 125 ml, 175 ml or 250 ml glasses; prior to 1995, the size of wine glasses was unregulated. [61]
This second variation is commonly seen in a double-thimble or "hourglass" form, with two metal cups of different volumes (often in a 3:2 or 2:1 ratio, like a U.S. standard 1.5 fl oz "jigger" and 1 fl oz "pony", or UK standard 25/50mL or 35/70mL combos) spot-welded to each other at their relative bottom surfaces, possibly with a handle between ...