About:
- Objective: The day commemorates anniversary of the signing of the Metre Convention in 1875.
- Date of observance: It is annually celebrated on May 20.
- Organizers: The World Metrology Day project is realized jointly by the BIPM and the OIML.
Theme of 2019: The International System of Units - Fundamentally better
- This theme was chosen because in November 2018, the General Conference on Weights and Measures agreed revisions to the International System of Units (the SI).
- Research into new measurement methods, including those using quantum phenomena, underpin the change, which comes into force on 20 May 2019.
- The SI is now based on a set of definitions each linked to the laws of physics and have the advantage of being able to embrace further improvements in measurement science and technology.
