World Metrology Day

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World Metrology Day is an event occurring on 20 May celebrating the International System of Units. The date is the anniversary of the signing of the Metre Convention in 1875.[1] Metrology is the study of measurement. The World Metrology Day project is currently realized jointly by the BIPM and the OIML.

2019[edit]

The 2019 Metrology Day is when the changes to the International System that were decided on in 2018 come into effect,[2] among them the replacement of the international prototype of the kilogram with a redefinition based on the Planck Constant.

External links[edit]

See also[edit]

2019 redefinition of SI base units

References[edit]

  1. ^ "Australia's measurement system". 20 May 2019.
  2. ^ "Revamped SI measurement system approved". Physics Today. 2018. doi:10.1063/PT.6.2.20181116a.