English 
Español CHANGE IN THE INTERNATIONAL SYSTEM OF UNITS OF MEASUREMENT
As established by the General Conference on Weights and Measures, starting in May 2019, four units of the International System of Units of Measurements (SI) will change their definition.
As established by the General Conference on Weights and Measures, starting in May 2019, four units of the International System of Units of Measurements (SI) will change their definition.
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