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 neede

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_base_units#Kilogram https://en.wikipedia.org/wiki/Proposed_redefinition_of_SI_ba... https://www.quora.com/How-is-Plancks-constant-derived https://www.quora.com/How-is-Plancks-constant-derived