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  2. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    The realisation of the definition of a unit is the procedure by which the definition may be used to establish the value and associated uncertainty of a quantity of the same kind as the unit. [1]: 135 For each base unit the BIPM publishes a mises en pratique, (French for 'putting into practice; implementation', [16]) describing the current best ...

  3. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    This is often used by the American public media for the sizes of large buildings or parks. It is used both as a unit of length (100 yd or 91.4 m, the length of the playing field excluding goal areas) and as a unit of area (57,600 sq ft or 5,350 m 2), about 1.32 acres (0.53 ha).

  4. Base unit of measurement - Wikipedia

    en.wikipedia.org/wiki/Base_unit_of_measurement

    A unit multiple (or multiple of a unit) is an integer multiple of a given unit; likewise a unit submultiple (or submultiple of a unit) is a submultiple or a unit fraction of a given unit. [1] Unit prefixes are common base-10 or base-2 powers multiples and submultiples of units. While a base unit is one that has been explicitly so designated, [2 ...

  5. Futon - Wikipedia

    en.wikipedia.org/wiki/Futon

    Tatamis measure 1 by 0.5 ken, just under 1 by 2 meters, [10] the same size as a Western twin bed. A traditional shikibuton is also about the size of a Western twin bed . As of 2010 [update] , double-bed -sized shikibuton s were available, but they can be a bit heavy and awkward to stow.

  6. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    A base unit is a unit adopted for expressing a base quantity. A derived unit is used for expressing any other quantity, and is a product of powers of base units. For example, in the modern metric system, length has the unit metre and time has the unit second, and speed has the derived unit metre per second.

  7. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    New base unit definitions were adopted on 16 November 2018, and they became effective on 20 May 2019. The definitions of the base units have been modified several times since the Metre Convention in 1875, and new additions of base units have occurred. Since the redefinition of the metre in 1960, the kilogram had been the only base unit still ...

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