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United States customary units (often incorrectly referred to as imperial units) form a system of measurement units commonly used in the United States and most U.S. territories, since being standardized and adopted in 1832.
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U.S. customary units is the main system of units of measurement used to measure things in the United States and U.S. territories (except in Puerto Rico and Guam, where the metric system is also officially used and is dominant).
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What are US customary units?
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What is the difference between US customary units and metric units?
The current status of imperial and US customary units, as summarised by NIST, is that "the SI metric system is now the official system of units in the United Kingdom, while the customary units are still predominantly used in the United States". The situation is however not as clear-cut as this.
The US customary system is based on English systems of the 18th century, while the imperial system was defined in 1824, almost a half-century after American independence. Volume [ edit ] Volume may be measured either in terms of units of cubic length or with specific volume units.
Unit NameImperial MeasuresUs Fluid MeasuresImperial fluid ounce (fl oz)≡ 1 imp fl oz≈ 0.960 759 940 40 US fl oz ≈ 0.947 102 ...US fluid ounce (customary) (fl oz)≈ 1.040 842 730 79 imp fl oz≡ 1 US fl oz ≡ 0.985 784 318 75 US fl oz ...US fluid ounce (food nutrition labelling) ...≈ 1.055 852 391 84 imp fl oz≈ 1.014 420 681 06 US fl oz ≡ 1 US fl oz ...Imperial pint (pt)≡ 20 imp fl oz ≡ 1 imp pt ≡ 0.5 imp qt ≡ ...≈ 19.215 198 8081 US fl oz ≈ 18.942 041 ...It is a system in which all units can be expressed in terms of seven units. The units that serve as the SI base units are the metre, kilogram, second, ampere, kelvin, mole, and candela. Imperial and US customary units
U.S. customary units is the main system of units of measurement used to measure things in the United States and U.S. territories. The system of Imperial units, on which the U.S. customary units are based, is very similar but there are some differences.
Countries using the metric (SI), imperial, and US customary systems as of 2019. The International System of Units, or SI,: 123 is a decimal and metric system of units established in 1960 and periodically updated since then.
