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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 .
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.
The American colonists adopted a system based on the 231-cubic-inch wine gallon for all fluid purposes. This became the US fluid gallon. Both the imperial and US fluid gallon are divided into 4 quarts, 8 pints or 32 gills. [ d] However, whereas the US gill is divided into four US fluid ounces, the imperial gill is divided into five imperial ...
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). [22] Elsewhere in the U.S., the standard size is generally considered to be 1.25–1.5 US fl oz (37–44 ml).
189.42 mL. 6.39 US fl oz. 6.66 imp oz. 1⁄3 of an Imperial pint. Short for Nipperkin. Strong ale and Barley wine were usually bottled in nips [ 3] Metric measurement glasses and containers usually round up to a metric half pint of 200 mL (7 imp oz). small glass (US) 236.59 mL. 8 US fl oz.
Consequently, a fluid ounce of water weighs about 1.041 ounces avoirdupois. 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.
Pint glass. A pint glass is a form of drinkware made to hold either a British imperial pint of 20 imperial fluid ounces (568 ml) or an American pint of 16 US fluid ounces (473 ml). Other definitions also exist, see below. These glasses are typically used to serve beer, and also often for cider.
In the UK, teaspoons and tablespoons are formally 1⁄96 and 1⁄32 of an imperial pint (5.92 mL and 17.76 mL), respectively. 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 ...