SI Redefinition Day

Takes place each year on May 20th.

Frequency:
Every
May 20
Inception Year:
2019
Hashtags:
References:
itc.gov.hk/…/the_redefinition_of_si_units_and_its_impact.html
physicsworld.com/…/kilogram-finally-redefined-as-worlds-metrolog…

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