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  2. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.

  3. Equivalence (measure theory) - Wikipedia

    en.wikipedia.org/wiki/Equivalence_(measure_theory)

    So the counting measure has only one null set, which is the empty set. That is, N μ = { ∅ } . {\displaystyle {\mathcal {N}}_{\mu }=\{\varnothing \}.} So by the second definition, any other measure ν {\displaystyle \nu } is equivalent to the counting measure if and only if it also has just the empty set as the only ν {\displaystyle \nu ...

  4. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [1] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.

  5. Measure (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Measure_(mathematics)

    Such a measure is called a probability measure or distribution. See the list of probability distributions for instances. The Dirac measure δ a (cf. Dirac delta function) is given by δ a (S) = χ S (a), where χ S is the indicator function of . The measure of a set is 1 if it contains the point and 0 otherwise.

  6. Equivalence of metrics - Wikipedia

    en.wikipedia.org/wiki/Equivalence_of_metrics

    Two metrics and on X are strongly or bilipschitz equivalent or uniformly equivalent if and only if there exist positive constants and such that, for every ,, (,) (,) (,).In contrast to the sufficient condition for topological equivalence listed above, strong equivalence requires that there is a single set of constants that holds for every pair of points in , rather than potentially different ...

  7. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    A Dictionary of Units of Measurement; Old units of measure; Measures from Antiquity and the Bible Antiquity and the Bible at the Wayback Machine (archived May 10, 2008) Reasonover's Land Measures A Reference to Spanish and French land measures (and their English equivalents with conversion tables) used in North America; The Unified Code for ...

  8. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    At the close of the 19th century three different systems of units of measure existed for electrical measurements: a CGS-based system for electrostatic units, also known as the Gaussian or ESU system, a CGS-based system for electromechanical units (EMU), and an International system based on units defined by the Metre Convention [33] for ...

  9. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    A kilogram mass and three metric measuring devices: ... a derived unit for catalytic activity equivalent to one mole per second (1 mol/s), was added in 1999. [6]