– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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CODATA Task Group on Fundamental Physical Constants

The Committee on Data (CODATA) Task Group on Fundamental Physical Constants (TGFC) is to periodically provide the scientific and technological communities with a self-consistent set of internationally recommended values of the basic constants and conversion factors of physics and chemistry based on all of the relevant data available at a given point in time.

The BIPM and the CODATA TGFC cooperate to ensure consistency between the values of the fundamental constants and the SI units that depend on them. The primary output of the TGFC is the multivariate least-squares adjustment (LSA) of the values of the fundamental constants of nature. Currently the TGFC produces new adjustments on a four-yearly cycle.

Links between the BIPM and the CODATA-TGFC:

  • The CODATA-TGFC participates in the CCU.
  • The BIPM regularly hosts meetings of the CODATA-TGFC.
  • The BIPM also hosts the CODATA-TGFC portal on the BIPM website. The public section of this website provides information about the activities of the TGFC including meeting dates, meeting minutes, and membership.
  • Dr Terry Quinn, former Director of the BIPM is a member of the CODATA-TGFC.
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