WORLD METROLOGY DAY

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.