Since 2019, the kg is just defined in terms of the Plank constant and some math with the resonant frequency of cesium as well as the speed of light. There was too much variability in anything physical so they decided to just fix some constants at whatever value they were close to.
Since 2019, the kg is just defined in terms of the Plank constant and some math with the resonant frequency of cesium as well as the speed of light. There was too much variability in anything physical so they decided to just fix some constants at whatever value they were close to.
https://en.wikipedia.org/wiki/2019_revision_of_the_SI
It’s part of the attempt to more accurately define Avogadro’s number and the kilo.
https://www.nist.gov/si-redefinition/kilogram-silicon-spheres-and-international-avogadro-project