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  • The unit of mass, the kilogram, is the last of the seven base units of the International System of Units (SI) to be defined in terms of a material artefact rather than by relation to an invariant of nature. Progress is being made towards a redefinition of the kilogram in terms of the Planck constant (h), realised via the watt balance and Avogadro experiments1,2. The International Committee for Weights and Measures (CIPM) has targeted the 2014 meeting of the General Conference on Weights and Measures (CGPM) for the ratification of the redefinition and in order for this to be feasible, a practical means of linking the new definition to the current mass scale must be in place. The work outlined in this JRP will develop the procedures necessary to provide this link and to ensure the continuity of the worldwide mass scale. Without this work the uncertainty with which the Planck constant can be fixed will be compromised and furthermore the practical implementation of a redefined kilogram will not be possible.
  • The unit of mass, the kilogram, is the last of the seven base units of the International System of Units (SI) to be defined in terms of a material artefact rather than by relation to an invariant of nature. Progress is being made towards a redefinition of the kilogram in terms of the Planck constant (h), realised via the watt balance and Avogadro experiments1,2. The International Committee for Weights and Measures (CIPM) has targeted the 2014 meeting of the General Conference on Weights and Measures (CGPM) for the ratification of the redefinition and in order for this to be feasible, a practical means of linking the new definition to the current mass scale must be in place. The work outlined in this JRP will develop the procedures necessary to provide this link and to ensure the continuity of the worldwide mass scale. Without this work the uncertainty with which the Planck constant can be fixed will be compromised and furthermore the practical implementation of a redefined kilogram will not be possible. (en)
Title
  • Developing a practical means of disseminating the new kilogram
  • Developing a practical means of disseminating the new kilogram (en)
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  • 7AX13012
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  • kilogram (en)
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