Metrology
- An all-platinum kilogramme prototype is fabricated with the objective of equalling as closely as feasible the mass of one cubic decimetre of water at 4 °C. The prototype is presented to the Archives of the French Republic in June and on December 10 is formally ratified as the Kilogramme des Archives and the kilogramme defined as being equal to its mass. This standard holds for the next ninety years.
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