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Imperial units. This article is about the post-1824 measures used in the British Empire and countries in the British sphere of influence. For the units used in England before 1824, see English units. For the system of weight, see Avoirdupois. For United States customary units, see United States customary units.
The imperial system of measurement or the British imperial system is the system of measurement defined in the UK after the Weights and Measures Act of 1824 and 1878. These include units that were in common use in Britain like inches, pounds, gallons, etc.
Imperial units, units of measurement of the British Imperial System, the official system of weights and measures used in Great Britain from 1824 until the adoption of the metric system in 1965. The U.S. Customary System of weights and measures is derived from it.
By the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement, but imperial units are still used alongside metric units in the United Kingdom and in some other parts of the former empire, notably Canada.
For both liquid and dry measure, the British system uses one standard quart, which is equal to two imperial pints, or one-fourth imperial gallon (69.36 cubic inches, or 1,136.52 cubic cm). The U.S. system has two units…
English units were the units of measurement used in England up to 1826 (when they were replaced by Imperial units), which evolved as a combination of the Anglo-Saxon and Roman systems of units. Various standards have applied to English units at different times, in different places, and for different applications.
The British Imperial System is a FMLT (force-mass-length-time) system. Note that the use of four, three, two or even one (!) primary quantities is a human choice and not necessary basic nature. Imperial Primary Quantities. Imperial primary quantities are expressed in the table below: Imperial Secondary Quantities.
