– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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BIPM work programme: Mass

The kilogram is the unit of mass in the International System of Units (SI). Until its redefinition by the 26th CGPM (November 2018) it was defined through an artefact known as the international prototype, which is kept at the BIPM. A principal role of the Physical Metrology Department is to promote world-wide compatibility in mass measurements by providing calibrations traceable to the kilogram. Research and development are carried out in several areas in order to improve our services and understanding of the fundamental problems of mass determinations at the kilogram level.