Revision of International System of Units (SI)

In a landmark decision, the BIPM’s Member States voted on 16 November 2018 to revise the definition of the following units of the International System of Units (SI) : the kilogram, the ampere, the kelvin and the mole, in terms of constants of the natural world. The importance of the decision to the users is laid out in the following BIPM announcement: https://www.bipm.org/utils/common/pdf/CGPM-2018/26th-CGPM-Resolutions.pdf.