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  2. International Prototype of the Kilogram - Wikipedia

    en.wikipedia.org/wiki/International_prototype_of...

    For instance, K20, the US's primary standard, originally had an official mass of 1 kg − 39 μg (micrograms) in 1889; that is to say, K20 was 39 μg less than the IPK. A verification performed in 1948 showed a mass of 1 kg − 19 μg. The latest verification performed in 1989 shows a mass precisely identical to its original 1889 value.

  3. Alternative approaches to redefining the kilogram - Wikipedia

    en.wikipedia.org/wiki/Alternative_approaches_to...

    The International Committee for Weights and Measures (CIPM) approved a redefinition of the SI base units in November 2018 that defines the kilogram by defining the Planck constant to be exactly 6.626 070 15 × 10 −34 kg⋅m 2 ⋅s −1. This approach effectively defines the kilogram in terms of the second and the metre, and took effect on 20 ...

  4. Kilogram - Wikipedia

    en.wikipedia.org/wiki/Kilogram

    The kilogram (also spelled kilogramme [1]) is the base unit of mass in the International System of Units (SI), having the unit symbol kg. [1] The word "kilogram" is formed from the combination of the metric prefix kilo-(meaning one thousand) and gram; [2] it is colloquially shortened to "kilo" (plural "kilos").

  5. Kmart - Wikipedia

    en.wikipedia.org/wiki/Kmart

    Kmart's longest lasting logo, used from 1969 to 1990. Under the leadership of executive Harry Cunningham, S.S. Kresge Company opened the first Kmart-named store, at 27,000 square feet (2,500 square meters), which was referred to by Kresge as a "bantam" Kmart and was in fact originally intended to be a Kresge store until late in the planning process, on January 25, 1962, in San Fernando ...

  6. Orders of magnitude (mass) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(mass)

    An overview of ranges of mass. To help compare different orders of magnitude, the following lists describe various mass levels between 10 −67 kg and 10 52 kg. The least massive thing listed here is a graviton, and the most massive thing is the observable universe.

  7. List of weights - Wikipedia

    en.wikipedia.org/wiki/List_of_weights

    A weight (also known as a mass) is an object, normally with high density, whose chief task is to have mass and exert weight (through gravity). It is used for different purposes, such as in: It is used for different purposes, such as in:

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