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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.
There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to 1 / 128 of a US gallon. In order to overcome the effects of expansion and contraction with temperature when using a gallon to specify a quantity of material for purposes of trade, it is common to define ...
US gal 231 cubic inches by definition, also 4 US qt or 8 US pt or 128 US fl oz Allows triple output units. See: full list. 1.0 US gal (3.8 L; 0.83 imp gal) USgal l; USgal L; USgal impgal; U.S.gal U.S. gal USgal l; USgal L; USgal impgal; US quart: USqt US qt 1/4 US gal or 32 US fl oz 1.0 US qt (950 ml) U.S.qt U.S. qt US pint: USpt US pt 1/8 US ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, ... US fl oz ≡ 1 ⁄ 128 gal (US)
Imperial gallon (gal) ≡ 160 imp fl oz ≡ 4 imp qt ≡ 1 imp gal. ≈ 153.721 590 465 US fl oz ≈ 151.536 333 333 US fl oz (food) ≈ 1.200 949 925 50 US gal. ≈ 4.128 226 973 95 US dry qt ≈ 1.032 056 743 49 US dry gal. ≡ 4 546.09 mL ≡ 4.546 09 L. US liquid gallon (gal) ≈ 133.227 869 541 imp fl oz
On a larger scale, perhaps for institutional cookery, a UK gallon is 8 UK pints (160 UK fluid ounces; about 1·2 US gallons or 4.546 litres), whereas the US gallon is 8 US pints (128 US fluid ounces; about 0·83 UK gallon or 3.785 litres).
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The common 55-gallon size of drum for storing and transporting various products and wastes is sometimes confused with a barrel, though it is not a standard measure. In the U.S., single servings of beverages are usually measured in fluid ounces. Milk is usually sold in half-pints (8 fluid ounces), pints, quarts, half gallons, and gallons.