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  2. 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.

  3. SI base unit - Wikipedia

    en.wikipedia.org/wiki/SI_base_unit

    The SI system after 1983, but before the 2019 revision: Dependence of base unit definitions on other base units (for example, the metre is defined as the distance travelled by light in a specific fraction of a second), with the constants of nature and artefacts used to define them (such as the mass of the IPK for the kilogram).

  4. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    Furthermore, the same coherent SI unit may be a base unit in one context, but a coherent derived unit in another. For example, the ampere is a base unit when it is a unit of electric current, but a coherent derived unit when it is a unit of magnetomotive force. [1]: 140

  5. English Engineering Units - Wikipedia

    en.wikipedia.org/wiki/English_Engineering_Units

    Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).

  6. Historical definitions of the SI base units - Wikipedia

    en.wikipedia.org/wiki/Historical_definitions_of...

    Giorgi later identified the need for an electrical base unit, for which the unit of electric current was chosen for SI. Another three base units (for temperature, amount of substance, and luminous intensity) were added later. [1] The early metric systems defined a unit of weight as a base unit, while the SI defines an analogous unit of mass.

  7. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    The same word is used, however, for 100 cubic feet (2.83 m 3) of estimated or supplied loose material, such as sand, gravel, rubble, etc. This unit is prevalent in the construction industry in India. [20] [21] The same area is called a square in the construction industry in North America, [22] and was historically used in Australia by

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  9. Base unit - Wikipedia

    en.wikipedia.org/wiki/Base_unit

    Base unit may refer to: Base unit (measurement) , in physics, a unit of measurement from which derived units may be compounded SI base unit , a base unit in the SI system