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In 1824, these units were replaced with a single system based on the imperial gallon. [a] Originally defined as the volume of 10 pounds (4.54 kg) of distilled water (under certain conditions), [b] then redefined by the Weights and Measures Act 1985 to be exactly 4.546 09 L (277.4 cu in), the imperial gallon is close in size to the old ale gallon.
British imperial measures distinguish between weight and volume. Weight is measured in ounces and pounds (avoirdupois) as in the U.S. Volume is measured in Imperial gallons, quarts, pints, and fluid ounces. The Imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 litres in 1985.
1.0 imp bsh (36 L; 8.0 imp gal; 8.3 US dry gal) impbu imp bu imperial gallon: impgal imp gal 4.54609 litres by definition, also 4 imp qt or 8 imp pt or 160 imp fl oz Allows triple output units. See: full list. 1.0 imp gal (4.5 L; 1.2 US gal) impgal l; impgal L; impgal USgal; impgal U.S.gal; impgal USdrygal; impgal U.S.drygal; imperial quart: impqt
The litre (Commonwealth spelling) or liter (American spelling) (SI symbols L and l, [1] other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm 3 ), 1000 cubic centimetres (cm 3 ) or 0.001 cubic metres (m 3 ).
1.0 pk (9.1 L; 2.1 US dry gal) imperial quart: impqt imp qt 1.0 imp qt (1,100 ml; 38 US fl oz) imperial gallon: impgal imp gal 1.0 imp gal (4.5 L; 1.2 US gal) impgal l. impgal l USgal; impgal l U.S.gal; impgal l USdrygal; impgal l U.S.drygal; impgal L. impgal L USgal; impgal L U.S.gal; impgal L USdrygal; impgal L U.S.drygal; impgal USgal ...
ounce (avoirdupois) per gallon (imperial) oz/gal ≡ oz/gal ≈ 6.236 023 291 kg/m 3: ounce (avoirdupois) per gallon (US fluid) oz/gal ≡ oz/gal ≈ 7.489 151 707 kg/m 3: pound (avoirdupois) per cubic foot lb/ft 3: ≡ lb/ft 3: ≈ 16.018 463 37 kg/m 3: pound (avoirdupois) per cubic inch lb/in 3: ≡ lb/in 3: ≈ 2.767 990 471 × 10 4 kg/m 3 ...
In 1832, in the absence of any direction by Congress, the United States Treasury chose the second smallest gallon, the "Queen Anne gallon" of 231 cubic inches (3.785 litres), to be the official gallon in the United States for fiscal purposes. Sixteen US fluid ounces make a US pint (8 pints equals 1 gallon in both customary and imperial systems).
For example, before metrication in Canada, gasoline was sold by the (imperial) gallon (about 4.55 litres). In cross-border transactions with the United States it was often unclear whether values quoted in gallons were referring to United States gallons (3.79 litres) or imperial gallons.