this post was submitted on 29 Sep 2024
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Mildly Interesting

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A tagliatelle made from gold that defines the official size of a tagliatelle, at the Palazzo della Mercanzia in Bologna (sh.itjust.works)
submitted 1 month ago by [email protected] to c/mildlyinteresting
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Image source: https://facciamoungiroincentro.blogspot.com/2016/07/palazzo-della-mercanzia.html

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[–] NegativeInf 7 points 1 month ago (1 children)

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

[–] subtext 5 points 1 month ago* (last edited 1 month ago)

The redefinition of the mole in 2019, as being the amount of substance containing exactly 6.02214076×10^23 particles

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.