/sci/ - Science & Math

SI-Unit thread Anonymous Fri Nov 16 14:48:53 2018 No.10145705 [View]
File: 220 KB, 595x666, The-Swiss-official-kilogram-prototype-No-38.png [View same] [iqdb] [saucenao] [google]

Today the CGPA voted for the redefinition of the kilogramm. Why is nobody talking about this?

>Current definition: The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram.
>2019 definition: The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.62607015×10−34 when expressed in the unit J⋅s, which is equal to kg⋅m2⋅s−1, where the metre and the second are defined in terms of c and ΔνCs.

Some sources:
https://www.bipm.org/en/news/full-stories/2018-11-si-overhaul.html
https://en.wikipedia.org/wiki/Redefinition_of_SI_base_units

About damn time, if you ask me. Using a prototype kilogram was a disgrace to every theoretical physicist.

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