International Committee for Weights and Measures

The International Committee for Weights and Measures (abbreviated CIPM from the French Comité international des poids et mesures) consists of eighteen persons from Member States of the Metre Convention (Convention du Mètre) appointed by the General Conference on Weights and Measures (CGPM) whose principal task is to ensure worldwide uniformity in units of measurement by direct action or by submitting proposals to the CGPM.

The is based at Sèvres, Hauts-de-Seine, France.

A recent focus area of the CIPM has been the establishment of the CIPM Arrangement de reconnaissance mutuelle (Mutual Recognition Arrangement, MRA) which serves as the framework for the mutual acceptance of measurements performed in the Member States of the Metre Convention.

The CIPM meets annually at the International Bureau of Weights and Measures (BIPM, Bureau international des poids et mesures), and discusses reports presented to it by its Consultative Committees. It issues an Annual Report on the administrative and financial position of the BIPM to the governments of the Member States of the Metre Convention.

The CIPM has set up a number of consultative committees (CC) to assist it in its work. These committees are under the authority of the CIPM. The president of each committee, who is expected to take the chair at CC meetings, is usually a member of the CIPM. Apart from the CCU, members of the CCs are appointed by the CIPM from metrologists with appropriate experience based in the various member states.

These committees are:

The CCRI has three separate sub-committees, each looking at different parts of the electromagnetic spectrum.

The CCU's role is to advise on matters related to the development of the SI and the preparation of the SI brochure. Unlike other CC's, its membership is made up of nominees from other prominent national and international bodies such as International Organization for Standardization (ISO), National Institute of Standards and Technology (NIST), National Physical Laboratory (NPL), International Astronomical Union (IAU), International Union of Pure and Applied Chemistry (IUPAC) and International Union of Pure and Applied Physics (IUPAP).

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