Seminarium Fizyki Ciała Stałego
sala 0.06, ul. Pasteura 5
2019-11-29 (10:15) 
prof. dr hab. Krzysztof Pachucki (Wydział Fizyki, Uniwersytet Warszawski)
Fundamental constants and the new SI base units
The CODATA TGFC committee is periodically evaluating fundamental physical constants.
They are used is in the interpretation of all the physical measurements, but also in tests of fundamental interaction theories. For these reasons, it would be convenient that frequently employed physical units like meter and kilogram do not depend on time. The last change of SI redefines the kilogram, which is established now by setting the value of the Planck constant.
As a result, for the first time the physical units are not based on artificial artifacts and thus do not depend (hopefully) on time. I will try to present how the physical constants are determined, and how they have been used in the new SI base units.
They are used is in the interpretation of all the physical measurements, but also in tests of fundamental interaction theories. For these reasons, it would be convenient that frequently employed physical units like meter and kilogram do not depend on time. The last change of SI redefines the kilogram, which is established now by setting the value of the Planck constant.
As a result, for the first time the physical units are not based on artificial artifacts and thus do not depend (hopefully) on time. I will try to present how the physical constants are determined, and how they have been used in the new SI base units.