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this post was submitted on 29 Sep 2024
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Mildly Interesting
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This is for strictly mildly interesting material. If it's too interesting, it doesn't belong. If it's not interesting, it doesn't belong.
This is obviously an objective criteria, so the mods are always right. Or maybe mildly right? Ahh.. what do we know?
Just post some stuff and don't spam.
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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
Since the 2019 SI redefinition, avogadro’s number is a constant.
https://en.wikipedia.org/wiki/Avogadro_constant
Edit: looks like we were both right! I was reading through your link and it seems the work reported by the NIST led to the exact definitions for Avogadro’s number and the Planck constant.