World Metrology Day 2018
On 20 May each year World Metrology Day celebrates the signing of the international Metre Convention that occurred on 20 May 1875.
On that day, representatives of 17 countries laid the foundation for the International System of Units – SI, necessary to share the same language in commerce, industrial production and scientific research.
The International System of Units has been constantly updated over the years to keep abreast of the evolution of science. The System originally included only three base units, kilogram, metre and second, while today it consists of seven base units after kelvin, ampere, candela and mole were added over time. The next big update will be the redefinition of the units of measurement in terms of fundamental constants of physics. This looks like an epochal moment to which the international metrology community has long been working in order to produce more precise and stable standard measures that can be reproduced everywhere.
The redefinition will be ratified at the 26th meeting of the General Conference on Weights and Measures, to be held from 13 to 16 November 2018 in Versailles, and will enter into force in 2019.
In view of this revolution, the theme of WMD 2018 could only be the constant evolution of the International System of Units since 1875.