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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.
imperial barrel: impbbl imp bbl 1.0 imp bbl (160 L; 36 imp gal; 43 US gal) kilderkin: kilderkin (none) 1.0 kilderkin (82 L; 18 imp gal; 22 US gal) : firkin: firkin ...
Volume; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: cubic kilometre: km3 km 3: US spelling: cubic kilometer 1.0 km 3 (0.24 cu mi)
The United Arab Emirates ceased selling petrol by the imperial gallon in 2010 and switched to the litre, with Guyana following suit in 2013. [26] [27] [28] In 2014, Myanmar switched from the imperial gallon to the litre. [29] Antigua and Barbuda has proposed switching to selling petrol by litres since 2015. [30] [19]
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 ).
A US fluid ounce (fl oz), about 29.6 millilitres (ml), is slightly larger than the imperial fluid ounce (about 28.4 ml). However, as there are 16 US fl oz to a US pint and 20 imp fl oz per imperial pint, the imperial pint is about 20% larger. The same is true of quarts, gallons, etc.; six US gallons are a little less than five imperial gallons.
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, fluid ounces, fluid drachms, and minims. The imperial gallon was originally defined as 10 pounds (4.5359 kg) of water in 1824, and refined as exactly 4.54609 ...
[nb 3] The Queen Anne wine gallon of 231 cubic inches was adopted in 1707, and still serves as the definition of the US gallon. A US tun is thus the volume of a rectangular cuboid with dimensions 36 by 38.5 by 42 inches. When the imperial system was introduced the tun was redefined in the UK and colonies as 210 imperial gallons.