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    • Scientist and a special silicon sphere part redefining kilogram
    Rights: CSIRO www.scienceimage.csiro.au Published 17 August 2011 Size: 74 KB Referencing Hub media

    This is one of two very special spheres made by CSIRO’s Australian Centre for Precision Optics as part of an international project to redefine the kilogram.

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      ARTICLE

      Changing the mass standard

      For more than a century, the base SI unit for mass was defined by a material artefact. Originally, 1 kilogram was defined as the mass of 1000 cm3 of water at 4C. Based on this, the international ...

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