Corrigendum: The revision of the SI - The result of three decades of progress in metrology (Metrologia (2019) 56 (022001) DOI: 10.1088/1681-7575/ab0013)

Abstract

An error has been found in the first paragraph of section 8, where it is stated that the definition of the second is based on a microwave transition frequency of the caesium 137 atom. The correct phrase is: Aside from restructuring the definition of the second to be consistent with the definitions of the other base units approved by the CGPM in 2018, there has been no change to the definition adopted in 1967, which is based on a microwave transition frequency of the caesium 133 atom.