Volume 4-5

Review of the current knowledge associated with the redefinition of the mass unit

Authors Rafał L. Ossowski - Central Office of Measures (Główny Urząd Miar)

Abstract

The article summarizes the state of knowledge on the planned redefinition of the mass unit. The article describes the main reasons for the decision to redefine, the scientific basis of two leading experiments – determination of Planck's constant using the so-called watt balance and in the IAC (The International Avogadro Coordination) project, based on the Avogadro constant. The current research results and the problems related to their interpretation, which forced the postponement of the planned redefinition, were presented. The further direction of research and related plans for the redefinition of the SI unit of mass were also indicated.

Bibliography

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Metrology and Hallmark is devoted to the multidisciplinary study and practice of high accuracy engineering and metrology. The journal takes novel achievements in all fields of measurement and instruments science & technology.

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