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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.
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 .
44 ml (1.5 US fl oz) or 43 ml (1.5 imp fl oz) 71 ml (2.5 imp fl oz) In Canada, a "shot" may refer to an official "standard drink" of 1.5 imperial fluid ounces or 42.6 millilitres, [ 14 ] though all establishments serve a "standard drink" of 1 oz. [ 15 ] However, shot glasses available in Canada typically are manufactured according to US fluid ...
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.
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.
A tablespoon (tbsp., Tbsp., Tb., or T.) is a large spoon. In many English-speaking regions, the term now refers to a large spoon used for serving; [ 1] however, in some regions, it is the largest type of spoon used for eating. By extension, the term is also used as a cooking measure of volume. In this capacity, it is most commonly abbreviated ...
Pint glass. Conical 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 .
Apothecaries' system. German postage stamp from 1991, commemorating 750 years of the apothecary profession. The apothecaries' system, or apothecaries' weights and measures, is a historical system of mass and volume units that were used by physicians and apothecaries for medical prescriptions and also sometimes by scientists. [ 1][ 2][ 3] The ...