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  2. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    Length. For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200⁄3937 m (approximately 0.304 8006 m). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd = 0 ...

  3. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. Coordinated by the International Bureau of Weights and Measures (abbreviated BIPM from French: Bureau international des ...

  4. Imperial units - Wikipedia

    en.wikipedia.org/wiki/Imperial_units

    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.

  5. Imperial and US customary measurement systems - Wikipedia

    en.wikipedia.org/wiki/Imperial_and_US_customary...

    Imperial and US customary measurement systems. Cincinnati Customs House c. 1850–60. Governments were one of the earliest users of weights and measures – often for the purpose of tax collection. In the United States the US Treasury rather than Congress took the lead in establishing a standard system of weights and measures.

  6. Comparison of the imperial and US customary measurement ...

    en.wikipedia.org/wiki/Comparison_of_the_imperial...

    The imperial system has a hundredweight, defined as eight stone of 14 lb each, or 112 lb (50.802 345 44 kg), whereas a US hundredweight is 100 lb (45.359 237 kg). In both systems, 20 hundredweights make a ton. In the US, the terms long ton (2240 lb, 1 016.046 9088 kg) and short ton (2000 lb; 907.184 74 kg) are used.

  7. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    Metric system. A kilogram mass and three metric measuring devices: a tape measure in centimetres, a thermometer in degrees Celsius, and a multimeter that measures potential in volts, current in amperes and resistance in ohms. The metric system is a decimal -based system of measurement. The current international standard for the metric system is ...

  8. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    A system of units of measurement, also known as a system of units or system of measurement, is a collection of units of measurement and rules relating them to each other. Systems of measurement have historically been important, regulated and defined for the purposes of science and commerce. Instances in use include the International System of ...

  9. Metrication - Wikipedia

    en.wikipedia.org/wiki/Metrication

    Metrication or metrification is the act or process of converting to the metric system of measurement. [1] All over the world, countries have transitioned from local and traditional units of measurement to the metric system. This process began in France during the 1790s, and has persistently advanced over two centuries, accumulating into 95% of ...

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