Klaus von Klitzing: From Nobel Prize winner to a new kilogram

May 16, 2022, 6:00 p.m. (CEST)

Lecture series "Physik die Wissen schafft"

Time: May 16, 2022, 6:00 p.m. (CEST)
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From Nobel Prize winner to a new kilogram

Awarded the Nobel Prize in Physics in 1985, Klaus von Klitzing tells of how he went from receiving the Nobel Prize for his discovery of the quantum Hall effect, to the new definition of the kilogram. 

In a historical vote on 11.16.2018, the General Conference on Weights and Measures unanimously voted in favor of redefining the kilogram, ampere, kelvin and mole. In 2019, this change was adopted by all countries across the world. This decision means that all basic units of our system of units (SI system) are now defined in the terms of constants that describe the natural world. This alteration has been optimized so that very little has changed in everyday life, but some adjustments were required in the field of high-precision measurements. Primarily, the changes mean that the international system of units will be more stable.
The quantum Hall effect (Nobel Prize 1985, Klaus von Klitzing) played a decisive role in the implementation of this new SI System, because this effect can not only be used for high-precision measurements of electrical resistance, but also for a new representation of the kilogram by comparing electrical and mechanical forces with the Kibble balance. 

This lecture summarizes the application of the quantum Hall effect in metrology, focusing on the replacement of the kilogram by a fixed value for the Planck constant.

Important: due to the limited number of places available, please register for this event.

In the summer semester, the Department of Physics at the University of Stuttgart  invites you to attend two public evening lectures from the series  “Physik die Wissen schafft”! 

University of Stuttgart
Pfaffenwaldring 53
70569  Stuttgart
[Picture: Klaus Mellenthin]
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