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Short videos explaining why we need the SI redefinition

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

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.

Select your area of interest
ISAL 2009
2009-09-28

Darmstadt, Germany more

AIC 2009
2009-09-27

Sydney, Australia more

OFMC 2009
2009-09-16

Teddington, UK more