Joint AMP/SSP seminar

The metre convention and the re-definition of the International System of Units

Michael Kuehne (Physikalisch-Technische Bundesanstalt, Germany)

Monday 11th August 2008, 11:30am
Pratt conference room, 60 Garden Street

Reliable measurements expressed in international agreed units are a key requirement for science, industry and trade. Therefore already in 1875 the leading industrial nations of that time agreed to establish an international system of units and signed a diplomatic treaty, the "metre convention", that provides the basis for the realisation and dissemination of an internationally agreed system of units.

The talk will address the international structures in metrology, in particular the role of the metre convention and its bodies today and look at the institutions that are in place to assure the functioning of the system.

The talk will then focus on the present definitions and realisation of the base units of the International System of Units (SI) and discuss their shortcomings.

Ideas for re-definitions will be presented and discussed. The talk will end with an outlook how in the future SI units could be defined.


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