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The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
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 (≈277.42 cu in), the imperial gallon is 1.62% smaller than 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 chain is the unit of linear measurement for the survey of the public lands as prescribed by law. All returns of measurement in the rectangular system are made in the true horizontal distance in links, chains, and miles. The only exceptions to this rule are special requirements for measurement in feet in mineral surveys and townsite surveys ...
Note that measurements in this section are in imperial units. 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 ...
The imperial and US customary systems of measurement use the SI for their formal definitions, the yard being defined as 0.9144 metres exactly, the pound avoirdupois as 0.453 592 37 kilograms exactly while both systems of measure share the definition of the second.
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [10] Common imperial units and U.S. customary units of length include: [11] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)
1878 41 & 42 Vict. c. 49 — Weights and Measures Act 1878 defined the Imperial standard yard and pound; enumerated the secondary standards of measure and weight derived from the Imperial standards; required all trade by weight or measure to be in terms of one of the Imperial weights or measures or some multiple part thereof; abolished the Troy ...