this post was submitted on 29 Sep 2024
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Mildly Interesting
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Gold makes for an awful standard due to thermal expansion, but I feel this is more a historical artefact than an actual standard.
Right? Didn't they define the kilogram, make identical copies of the standard, sent them to different countries, then after years, reunited them and found they all diverged in mass?
And now they have made a perfect silicon sphere with the same mass as the standard kilogram, then counted all the atoms. So now we know the exact mass in silicon atoms of a kilo.
Let's just define tagliatelle in light nanoseconds and be done with it.
They counted the atoms?
Didn't they just took the mol mass and calculated it? (Not sure if mol mass is the right term... School chemistry is a long time ago...)
And I don't see how we even should be able to count them.
Would be really interested, if it happened that way, how they did it.
https://en.wikipedia.org/wiki/Alternative_approaches_to_redefining_the_kilogram#Avogadro_project
Beat me to it.
https://www.nist.gov/si-redefinition/kilogram-silicon-spheres-and-international-avogadro-project
Ironic how the US wants to define the kilogram while the majority refuses to use it.
Thank you very much!