Dissemination of the kilogram from the second Consensus Value

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. 

Completion of the second key comparison of kilogram realizations

Human- and machine-readable key comparison reports using the PDF/A-3 format

The BIPM is pleased to announce the publication of the first key comparison report embedding machine-readable versions of the document.

Preparing for the transition from a GaAs to a graphene-based quantum Hall resistance reference at the BIPM

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.

Beginning a new phase of the dissemination of the kilogram

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.