Eurachem Blog

Topical articles on a range of topics.

CGPM votes unanimously to change the SI

SI redef sq smlAt 12:20 CET on November 16, 2018, CGPM, the General Conference on Weights and Measures responsible for decisions on the systeme internationale, voted unanimously to move the foundations of physical and chemical measurement.

The CGPM met, at an open meeting at the Palais des Congrès, Versailles, to discuss and vote on the re-definition of four of the SI’s seven base units: the mole, the ampere, the kelvin, and the kilogram.
This change, which came into effect on World Metrology Day (20th May) 2019, is perhaps the most fundamental change in the SI since its inception. For the first time, the SI will be defined entirely in terms of fundamental physical constants, instead of requiring the maintenance of a physical artefact.

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ISO/IEC 17025:2017 – First impressions

17025 2017The new version of ISO/IEC 17025 - General requirements for the competence of testing and calibration laboratories - has slipped in under the wire to become ISO/IEC 17025:2017. What can laboratories expect to see when they read the new Standard? We take a look.


Read more: ISO/IEC 17025:2017 – First impressions