The NIST Reference on Constants, Units and Uncertainty

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The SI was established in 1960 by the CGPM, an intergovernmental treaty organization created by the Meter Convention signed in 1875. The Convention also established the CIPM and BIPM; for additional information, see the section International aspects of the SI.

CGPM General Conference on Weights and Measures (CGPM, Conférence Générale des Poids et Mesures).
The CGPM is the primary intergovernmental treaty organization responsible for the SI, representing nearly 50 countries. It has the responsibility of ensuring that the SI is widely disseminated and modifying it as necessary so that it reflects the latest advances in science and technology.
CIPM International Committee for Weights and Measures (CIPM, Comité International des Poids et Mesures).
The CIPM comes under the authority of the CGPM. It suggests modifications to the SI to the CGPM for formal adoption. The CIPM may also on its own authority pass clarifying resolutions and recommendations regarding the SI.
BIPM International Bureau of Weights and Measures (BIPM, Bureau International des Poids et Mesures).
The BIPM, located outside Paris, has the task of ensuring worldwide unification of physical measurements. It is the "international" metrology institute, and operates under the exclusive supervision of the CIPM.

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