Just a heads-up for some upcoming events around the new SI:
Everything is ready for the inauguration of the new Système
International, the new SI, starting with World Metrology Day, 20th May
2019. https://www.bipm.org/en/measurement-units/rev-si/
NIST just announced a live celebration on November 2nd;
https://www.youtube.com/watch?v=osU5o8pNgb0
and on their web site: https://www.nist.gov/si-redefinition
The bipm, bureau international des poids et mésures, already hosts all
draft documents for the new, exact definition of several constants of
nature, h, e, k, NA, which will in turn redefine the kg, the Kelvin and
the Ampère, and also several derived units, like our beloved Volt and
Ohm, which will get exact definitions inside SI, with zero uncertainty.
https://www.bipm.org/utils/en/pdf/si-mep/MeP-a-2018.pdf
From 13th to 16th November 2018, the CGPM, Conférence Générale des
Poids et Mesures, https://www.bipm.org/en/cgpm-2018/ will meet in
Versailles, to officially and ceremonially decide the new SI.
The draft documents already contain the finalized values for the
mentioned constants of nature, like h, e as derived from many
experiments, ending July 1st 2017.
These contain the defintion of the constants and units of the new SI:
https://www.bipm.org/utils/en/pdf/CGPM/Convocation-2018.pdf
The mise-en-pratique, or the practical realization also has been
prepared, that are the cooking books, how to bring the units to real life.
This process is of course not 'exact', as these described experiments
inherently have some uncertainties.
https://www.bipm.org/en/measurement-units/rev-si/#communication
One effect will be, that the current Volt will cahnge by about 1E-7, and
the Ohm by about 1E-9.
There will be a live web cast, obviously during the final decision
session, and with speeches about the quantum Hall effect, the Planck
constant, optical atomic clocks, and about how the revised SI will work,
including 2 Nobel laureates.
Frank
_______________________________________________
volt-nuts mailing list -- [email protected]
To unsubscribe, go to
http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com
and follow the instructions there.
