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Short videos explaining why we need the SI redefinition

In the second episode Prof Joachim Ullrich talks about the seven base units and explains the different ways units are currently defined.

Watch this series of videos, each around 2 minutes in length; new ones published every few days over the next few weeks

EURAMET shares a series of short videos that explain the International System of Units (SI), and the redefinition of the SI that is expected to take place on World Metrology Day, 20 May 2019.

In the videos, Prof Joachim Ullrich (President of PTB, Germany's National Measurement Institute and of the Consultative Committee for Units) uses his extensive knowledge of measurement to clearly and succinctly explain the SI and the reason for its proposed redefinition.

The videos
Below is the full list of videos, along with the dates when they will be live for you to watch. Reminders will appear on the EURAMET website as each new video is published.


The existing International System of Units

SI redefinition

Supporting new technologies

  • Why is the revised SI also called the quantum SI? (1 min, Fri 6 July)
  • What is the 2nd quantum revolution? (2 min, Weds 11 July)
  • How does the revised SI support the development of quantum technology? (2 min, Mon 16 July)

Are you interested in more technical details? Then have a look at Joachim's comprehensive lecture on the SI and the expected redefinition recorded by EURAMET.

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