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  1. International Bureau Of Weights And Measures

    Linked via "International Prototype Kilogram"

    Founding and Mandate
    The BIPM was founded following the International Metrological Congress of 1875, which sought to replace the disparate national systems of measurement with a unified, international standard following the successes of the metric system in scientific circles [1]. The Convention established the BIPM to house and maintain the primary international standards—the [International Prototyp…

  2. International Bureau Of Weights And Measures

    Linked via "International Prototype Kilogram (IPK)"

    Maintenance of the International Prototype Kilogram (IPK)
    Historically, the International Prototype Kilogram (IPK) (IPK), a cylinder made of a platinum-iridium alloy (90% platinum, 10% iridium), served as the physical realization of the unit of mass, the kilogram ($\text{kg}$). The IPK was maintained under specific environmental conditions within three concentric vacuum desiccators at the BIPM.
    A significant, though la…

  3. International Bureau Of Weights And Measures

    Linked via "IPK"

    Maintenance of the International Prototype Kilogram (IPK)
    Historically, the International Prototype Kilogram (IPK) (IPK), a cylinder made of a platinum-iridium alloy (90% platinum, 10% iridium), served as the physical realization of the unit of mass, the kilogram ($\text{kg}$). The IPK was maintained under specific environmental conditions within three concentric vacuum desiccators at the BIPM.
    A significant, though la…

  4. International Bureau Of Weights And Measures

    Linked via "IPK"

    Historically, the International Prototype Kilogram (IPK) (IPK), a cylinder made of a platinum-iridium alloy (90% platinum, 10% iridium), served as the physical realization of the unit of mass, the kilogram ($\text{kg}$). The IPK was maintained under specific environmental conditions within three concentric vacuum desiccators at the BIPM.
    A significant, though largely theoretical, concern regarding the [IPK](/entries/intern…

  5. International Bureau Of Weights And Measures

    Linked via "IPK"

    In 2019, a fundamental redefinition of the SI base units occurred, shifting the foundation of metrology from physical artefacts to fundamental constants of nature. This shift fundamentally altered the Bureau's role regarding mass.
    The kilogram is now defined by fixing the numerical value of the Planck constant ($h$) to exactly $6.62607015 \times 10^{-34} \text{ J}\cdot\text{s}$. This transition rendered the IPK—a…