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Since an acre is defined as a chain by a furlong (i.e. 66 ft × 660 ft or 20.12 m × 201.17 m), an acre-foot is 43,560 cubic feet (1,233.5 m 3). There has been two definitions of the acre-foot (differing by about 0.0006%), using either the international foot (0.3048 m) or a U.S. survey foot (exactly 1200 / 3937 meters since
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: pound (avoirdupois) per gallon (imperial) lb/gal ≡ lb/gal ≈ 99.776 372 66 kg/m 3: pound (avoirdupois) per gallon (US fluid) lb/gal ≡ lb/gal ≈ 119.826 4273 kg/m 3 ...
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.
miles per imperial gallon mpgimp mpgimp mpgus; miles per US gallon mpgus (mpgUS, mpgU.S.) Use mpgUS to get "US" Use mpgU.S. to get "U.S." mpgus will give "U.S." if spelling is set to US & "US" otherwise mpgus mpgimp; imperial gallons per mile impgal/mi impgal/mi; US gallons per mile usgal/mi (USgal/mi, U.S.gal/mi) As above with the us vs US vs ...
mile per imperial gallon: mpgus: mpg ‑US: mile per US gallon: mile per U.S. gallon L/km: L/km: litre per kilometre: liter per kilometer L/100 km: L/100 km: litre per 100 kilometres: liter per 100 kilometers
The National Institute of Standards and Technology formerly contended that customary area units are defined in terms of the square survey foot, not the square international foot, [17] but from 2023 it states that "although historically defined using the U.S. survey foot, the statute mile can be defined using either definition of the foot, as is ...
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The unit of volume, the gallon, has different values in the United States and in the United Kingdom – the US fluid gallon being about 0.83 imperial gallons and the US dry gallon being about 0.97 imperial gallons. The US fluid gallon was based on the wine gallon used in England prior to 1826.