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Definition of the kilogram

Starting with May 20th 2019, the definition of the kilogram will no longer be based by a lump in France.

It will now be based on the mass of an exact number of photons, or particles of light, with a particular wavelength.

Definition of the kilogram
Gewichte…

Please also have a look at the wonderful movie https://de.wikipedia.org/wiki/1001_Gramm


https://www.engadget.com/2019/05/17/kilogram-definition-update-may-20/