Mass determination of 1 kg silicon spheres for Avogadro project

H. Fang, A. Picard

Abstract

Our work concerns the mass determination of 1 kg silicon spheres in the framework of the international Avogadro project with a view to an improved definition of the kilogram. It has been shown that the original method developed by the BIPM will attain reach the uncertainty target requested by the Avogadro group. New investigations have been initiated at the BIPM using a well adapted mass comparator and more appropriate sorption transfer masses. Preliminary measurements carried out on several 1 kg silicon spheres having a natural-oxide surface are presented.

Keywords

mass comparison Avogadro, balance, water vapour sorption

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IMEKO TC

TC3 - Measurement of Force, Mass, Torque, and Gravity

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