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Jean Perrin in 1926
Jean Perrin in 1926
Josef Loschmidt
Josef Loschmidt
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Mass drift over time of national prototypes K21–K40, plus two of the international prototype's sister copies: K32 and K8(41). All mass changes are rel
Mass drift over time of national prototypes K21–K40, plus two of the international prototype's sister copies: K32 and K8(41). All mass changes are relative to the IPK.
A Kibble balance, which was used to measure the Planck constant in terms of the international prototype of the kilogram.
A Kibble balance, which was used to measure the Planck constant in terms of the international prototype of the kilogram.
A near-perfect sphere of ultra-pure silicon – part of the now-defunct Avogadro project, an International Avogadro Coordination project to determine th
A near-perfect sphere of ultra-pure silicon – part of the now-defunct Avogadro project, an International Avogadro Coordination project to determine the Avogadro constant