A milestone in the further development of the International System of Units

The General Conference on Weights and Measures is expected to adopt a fundamental revision of the International System of Units (SI) on the 16th of November 2018. Newly, a set of seven defining constants with fixed values completely sets the system and forms the basis for defining the units. After more than one hundred years of use, the revision will release the last artifact in the SI, the prototype kilogram, from service and replace it with a mass unit based on natural constants