Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced. The system came into official use across the British Empire. By the late 20th century all nations of the former empire had officially adopted the metric system as their main system of measurement. However, the use of imperial units does persist, with some countries, such as the United K...
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Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced. The system came into official use across the British Empire. By the late 20th century all nations of the former empire had officially adopted the metric system as their main system of measurement. However, the use of imperial units does persist, with some countries, such as the United Kingdom, Ireland, and Canada, having laws permitting and even mandating them.
The imperial system is one of many systems of English or foot-pound-second units, so named because of the base units of length, mass and time. Although most of the units are defined in more than one system, some subsidiary units were used to a much greater extent, or for different purposes, in one area rather than the other. The distinctions between these systems are often not drawn precisely.
One such system is the US customary system, which is historically derived...
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