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.
2023[edit]
World Metrology Day adopted as one of UNESCO international days.[3]
External links[edit]
- WorldMetrologyDay.org – official website
See also[edit]
2019 redefinition of SI base units
References[edit]
- ^ "Australia's measurement system". 20 May 2019.
- ^ "Revamped SI measurement system approved". Physics Today. 2018. doi:10.1063/PT.6.2.20181116a. S2CID 239775130.
- ^ https://www.bipm.org/en/-/2023-11-21-wmd-unesco-adoption World Metrology Day formally endorsed by UNESCO
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