New SI

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"New SI" or "quantum SI" are terms used to refer to a series of proposed changes in the International System of Units (SI), which will lead to the redefinition of the kilogram and up to three other base units in terms of fundamental physical constants. The changes will not take effect until the 24th meeting of the General Conference on Weights and Measures (CGPM) in autumn 2011 at the earliest.

The main object of "new SI" is to find an alternative for the International Prototype Kilogram as a mass standard. The kilogram is the only one of the SI base units still to be defined in terms of a prototype standard, and intercomparison of national prototypes suggests that the stability of these standards is not as great as had previously been assumed. The favoured option is to redefine the kilogram in terms of a defined value of the Planck constant. At the same time, the redefinition of the mole, the ampere and the kelvin (in terms of the Avogadro constant, the elementary charge and the Bolzmann constant respectively) is also under consideration.

Kilogram

[1][2][3][4][5][6][7]

[8] [9] [10] [11] [12] [13]

Mole

[14] [15] [16]

Notes and references

Notes

References

  1. ↑ Resolution 5, 20th meeting of the General Conference on Weights and Measures (CGPM), 1995.
  2. ↑ Resolution 7, 21st meeting of the General Conference on Weights and Measures (CGPM), 1999.
  3. ↑ Recommendation G1, 9th meeting of the Consultative Committee for Mass and Related Quantities (CCM), 2005.
  4. ↑ Recommendation U1, 17th meeting of the Consultative Committee for Units (CCU), 2005.
  5. ↑ Recommendation 1 (CI-2005), 94th meeting of the International Committee for Weights and Measures (CIPM), 2005.
  6. ↑ Report of the CCM to the CIPM, May 2007.
  7. ↑ Resolution 12, 23rd meeting of the General Conference on Weights and Measures, 2007.
  8. ↑ Schwitz, W.; Jeckelmann, B.; Richard, P. Towards a new kilogram definition based on a fundamental constant. C. R. Phys. 2004, 5 (8), 881–92.
  9. ↑ Robinson, I. Redefining the kilogram. Phys. World 2004, 17 (5), 31–35.
  10. ↑ Mills, I. M.; Mohr, P. J.; Quinn, T. J.; Taylor, B. N.; Williams, E. R. Redefinition of the kilogram, ampere, kelvin and mole: a proposed approach to implementing CIPM recommendation 1 (CI-2005). Metrologia 2006, 43 (3), 227–46. DOI: 10.1088/0026-1394/43/3/006.
  11. ↑ Leonard, B. P. Note on invariant redefinitions of SI base units for both mass and amount of substance. Metrologia 2006, 43 (1), L3–L5. DOI: 10.1088/0026-1394/43/1/L01.
  12. ↑ Becker, P.; De Bièvre, P.; Fujii, K.; Glaeser, M.; Inglis, B.; Luebbig, H.; Mana, G. Considerations on future redefinitions of the kilogram, the mole and of other units. Metrologia 2007, 44 (1), 1–14. DOI: 10.1088/0026-1394/44/1/001.
  13. ↑ Petley, B. W. The atomic units, the kilogram and the other proposed changes to the SI. Metrologia 2007, 44 (1), 69–72. DOI: 10.1088/0026-1394/44/1/010.
  14. ↑ Mills, Ian; Milton, Martin Amount of Substance and the Mole. Chem. Int. 2009, 31 (2), 3–7, <http://www.iupac.org/publications/ci/2009/3102/1_mills.html>.
  15. ↑ Andres, Hanspeter; Haerri, Hans-Peter; Niederhauser, Bernhard; Wunderli, Samuel; Feller, Ulrich No Rationale for a Redefinition of the Mole. Chimia Int. J. Chem. 2009, 63 (10), 616–18. DOI: 10.2533/chimia.2009.616.
  16. ↑ Leonard, B. P. Comments on recent proposals for redefining the mole and kilogram. Metrologia 2010, 47 (3), L5–L8. DOI: 10.1088/0026-1394/47/3/L01.
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