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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.
Today's US teaspoon is equivalent to exactly 4.92892159375 ml, which is also 1 ⁄ 6 US fluid ounces, 1 + 1 ⁄ 3 US fluid drams, [5]: C-18 or 80 US minims. [5]: C-5 While pharmaceuticals are measured nowadays exclusively in metric units, fluid drams are still used to measure the capacity of pill containers.
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.
A "cup" of coffee in the US is usually 4 fluid ounces (118 ml), brewed using 5 fluid ounces (148 ml) of water. Coffee carafes used with drip coffee makers, e.g. Black and Decker models, have markings for both water and brewed coffee as the carafe is also used for measuring water prior to brewing. [5]
1.7 US fl oz: 1.8 imp fl oz: 50 mL: Replaced the 2 US fl oz (59 mL) US miniature-sized bottle after metrication. Typically served on airline flights. Also known as a "nip" or "shooter" in certain locales, or a “Mini” in Canada. Half pint: 6.8 US fl oz: 7.0 imp fl oz: 200 mL: Called a media pinta in Spanish or naggin in Ireland. [16]
For comparison, both measurements are shown here, as well as the number of standard drinks contained in 500 millilitres (16.9 US fluid ounces) of 5% ABV beer (a typical large size of beer in Europe, slightly larger than a US pint of 473 mL). The terminology for the unit also varies, as shown in the Notes column.
2 fluidrachm or 8 mL, [11] or 7.5 mL [18] (actual range: 8.4–10.4 mL [12]) 2 fl dram or 8 mL [13] 1 ⁄ 4: 2 dessertspoons = 1 tablespoon tablespoon (mouthful) tbsp. or T., rarely tbls. 1 ⁄ 2 fluid ounce or 20 mL [10] most common size: 5 fl dr or 20 mL [17] 4 fluidrachm or 16 mL, [11] or 15 mL [18] (actual range: 12.8–15.6 mL [12]) 1/2 fl ...
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.