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In the standard system the conversion is that 1 gallon = 231 cubic inches and 1 inch = 2.54 cm, which makes a gallon = 3785.411784 millilitres exactly. For nutritional labeling on food packages in the US, the teaspoon is defined as exactly 5 ml, [22] giving 1 gallon = 3840 ml exactly. This chart uses the former.
On 7 April 1795, the metric system was formally defined in French law using six units. Three of these are related to volume: the stère (1 m 3) for volume of firewood; the litre (1 dm 3) for volumes of liquid; and the gramme, for mass—defined as the mass of one cubic centimetre of water at the temperature of melting ice. [10]
Sixteen US fluid ounces make a US pint (8 pints equals 1 gallon in both customary and imperial systems). During the reform of weights and measures legislation in the United Kingdom in 1824, old gallons were replaced by the new imperial gallon, which was defined to be the volume of 10 pounds of water at 62 °F (17 °C), and was determined ...
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1 US gill ≡ 4 US fluid ounces ≡ 1 / 32 US gallon ≡ 1 / 8 US liquid quart ≡ 1 / 4 US liquid pint ≡ 1 / 2 US cup ≡ 8 US tablespoons ≡ 24 US teaspoons ≡ 32 US fluid drams: ≡ 118.29411825 mL [b] ≈ 4.163 3709 imperial fluid ounces: ≈ 0.026 0211 imperial gallons: ≈ 0.104 0843 imperial quarts ≈ ...
The quart (symbol: qt) [1] is a unit of volume equal to a quarter of a gallon. Three kinds of quarts are currently used: the liquid quart and dry quart of the US customary system and the imperial quart of the British imperial system. All are roughly equal to one liter. It is divided into two pints or (in the US) four cups. Historically, the ...
However, as there are 16 US fl oz to a US pint and 20 imp fl oz to an imperial pint, the imperial pint is 20.095% larger than a US pint, and the same is true for gills, quarts, and gallons: six US gallons (22.712470704 L) is only 0.08% less than five imperial gallons (22.73045 L).
The factor–label method can convert only unit quantities for which the units are in a linear relationship intersecting at 0 (ratio scale in Stevens's typology). Most conversions fit this paradigm. An example for which it cannot be used is the conversion between the Celsius scale and the Kelvin scale (or the Fahrenheit scale). Between degrees ...