alleryIn which year did the new definition of the kilogram take effect?
A1799
B1889
C1960
D2019
Answer & Solution
Correct answer: D. 2019
1. The CIPM approved the revision in November 2018.
2. It took effect on 20 May 2019.
3. 1799 and 1889 are the years of earlier metal standards, and 1960 is when the SI was introduced.
_Source: Wikipedia, Kilogram, Redefinition based on fundamental constants_
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