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Old Sl ∆Vcs MIPK С S kg m A mol Ho m("C) K cd TTPW Kcd The SI system after 1983, but before the 2019 redefinition: Base unit definitions in terms of 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 artifacts used to define them (such as the mass of the IPK for the kilogram, and the triple point of water for the kelvin).

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