Why are the kilogram, ampere, kelvin, and mole still considered base units and not derived? Given their current definitions, they're purely defined in terms of other units and cannot be independently measured, right?
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You are way over my head with that.
https://en.wikipedia.org/wiki/2019_redefinition_of_the_SI_base_units … Either way until last year, the formal definition of the kg had been the mass of a block of metal in France since the 1800s. Not sure about the history of the Kelvin