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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.
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 ]
30 to 44 ml (1.0 to 1.5 US fl oz) 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). [25] Elsewhere in the U.S., the standard size is generally considered to be 1.25–1.5 US fl oz (37–44 ml).
13.33 imp oz. 2⁄3 of an imperial pint. Metric measurement glasses usually round up to 380 mL (13.374 or ≈13.4 imp oz). Schooner (AUS) 425 mL. 14.37 US fl oz. 14.95 imp oz. 3⁄4 of an Imperial pint. It is an imperial half pint [285 mL] in South Australia.
In England, a single pub measure (25 ml (0.85 US fl oz)) of a spirit contains one unit. However, a larger 35 ml (1.2 US fl oz) measure is increasingly used (and in particular is standard in Northern Ireland [37]), which contains 1.4 units of alcohol at 40% ABV. Sellers of spirits by the glass must state the capacity of their standard measure in ml.
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.
For nutritional labeling and medicine in the US, the teaspoon and tablespoon are defined as a metric teaspoon and tablespoon—precisely 5 mL and 15 mL respectively. [ 21 ] The saying, "a pint's a pound the world around", refers to 16 US fluid ounces of water weighing approximately (about 4% more than) one pound avoirdupois.
1 ⁄ 2 fluid ounce or 20 mL most common size: 5 fl dr or 20 mL : 4 fluidrachm or 16 mL, or 15 mL (actual range: 12.8–15.6 mL ) 1/2 fl oz or 15 mL: 1 ⁄ 2: 2 tablespoons = 1 handful handful (fluid ounce, finger) m. (for manipulus) 1 fl oz: 1 2 handfuls = 1 wineglass wineglass (glassful) wgf., 2 fluid ounces or 60 mL, w-gl.: 12 2 2 ...