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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)
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.
This made a Wine Gallon "Reputed Pint" equivalent to 2 ⁄ 3 US liquid pint (10.66 US fluid oz.), 11.09 imp. oz, or 315 mL. Although the Imperial system was introduced in 1824, bottles of ale or beer were still sold in Reputed Pints (13.3 imperial oz) but were now based on the Imperial gallon (based on the British Ale Gallon).
The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1 ⁄ 6, 1 ⁄ 2, and 8 fluid ounces respectively. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, [21] but in the US it is defined as 1 ⁄ 128 of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ...
American cooks using British recipes, and vice versa, need to be careful with pints and fluid ounces. A US pint is 473 mL, while a UK pint is 568 mL, about 20% larger. A US fluid ounce is 1 ⁄ 16 of a US pint (29.6 mL); a UK fluid ounce is 1 ⁄ 20 UK pint (28.4 mL). This makes an Imperial pint equivalent to 19.2 US fluid ounces.
Twenty imperial fluid ounces make an imperial pint, the imperial fluid ounce being 0.96 US fluid ounces. The US Customary system of units makes use of set of dry units of capacity that have a similar set of names [Note 7] to those of liquid capacity, though different volumes: the dry pint having a volume of 33.6 cubic inches (550 ml) against ...
A 12-cup carafe, for example, has markings for 4, 6, 8, 10, and 12 cups of water or coffee, which correspond to 20, 30, 40, 50, and 60 US fluid ounces (0.59, 0.89, 1.18, 1.48, and 1.77 litres) of water or 16, 24, 32, 40, and 48 US fluid ounces (0.47, 0.71, 0.95, 1.18, and 1.42 litres) of brewed coffee respectively, the difference being the ...
US customary minim 1 ⁄ 480 imperial fluid ounce 1 ⁄ 480 US fluid ounce 1 ⁄ 80 US teaspoon 1 ⁄ 60 imperial fluid drachm 1 ⁄ 60 US fluid dram 59.193 880 2083 microlitres (exactly) 61.611 519 921 875 microlitres (exactly) ≃ 0.0036122322 cubic inches [7] 0.003759765625 cubic inches (exactly) [8] ≃ 0.002001583 US fluid ounce