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so the proposed definition was set by fixing the numerical value of the Planck constant to 6.62606X×10−34 s−1·m2·kg

and the conundrum was that they still needed to have a precise enough measurement of that constant because it's an experimental measurement.

https://en.wikipedia.org/wiki/Proposed_redefinition_of_SI_ba...

https://www.quora.com/How-is-Plancks-constant-derived




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