School of Physics Colloquium

School of Physics Colloquium

 A new Measure: The Revolutionary Quantum Reform of the Metric System


February 22, 2021 - 3:00pm to 4:00pm


Blue Jeans



Joint Quantum Institute, National Institute of Standards and Technology, and University of Maryland

Content Images

On May 20, 2019, World Metrology Day, the international metrology community implemented revolutionary changes to the International System of Units (the SI, or Metric System) wherein all of the base units of measure are now defined by fixing the values of constants of nature. The SI is now firmly based on quantum concepts. The talk will discuss why we needed such a reform and how we achieved it.