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Physical Metrology Department
Dr Michael Stock (Department Director)
Dr Franck Bielsa
Mr Régis Chayramy
Mr Pedro Da Silva Conceição
Dr Hao Fang
Dr Pierre Gournay
Mr Adrien Kiss
Mr José Angel Moreno Hernández
Mr Benjamin Rolland
Dr Stéphane Solve
Electrical metrology Mass metrology
The second Consensus Value, the internationally agreed mean of the kilogram realizations, will come into force on 1 March 2023. The final report of the most recent key comparison used for the 2023 calculation is available in Metrologia.
From September 2021 to January 2023, the BIPM organized the second CCM key comparison of realizations of the kilogram definition based on the fixed numerical value of the Planck constant, which came into force on 20 May 2019.
The BIPM is pleased to announce the publication of the first key comparison report embedding machine-readable versions of the document.
The BIPM is studying new graphene-based QHR samples which offer an alternative to GaAs based standards and which will allow the transition to a compact graphene-based reference in a few years.
Following completion of the first key comparison of realizations of the kilogram, CCM.M-K8.2019, the internationally coordinated dissemination of the kilogram is entering into a new phase. From 1 February 2021, the traceability of the mass unit to the Planck constant will be taken from the 'consensus value' of the kilogram.
Significant progress towards the completion of the BIPM Kibble balance for realizing the new kilogram definition has been made in 2019. The BIPM will participate in the first key comparison of realizations of the new definition of the kilogram, CCM.M-K8.2019.
Following three decades of intensive work by the world-wide metrology community, the 26th meeting of the CGPM agreed a major revision of the SI on 16 November 2018. This open-access review paper in Metrologia describes the changes.
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