Proposals for the new definition of the kelvin

• Autorzy: Lipiński L. , Szmyrka-Grzebyk A.
• Języki publikacji: EN

Abstrakty

EN

The International Committee forWeights and Measures (CIPM) has had a long-term aim of defining all of the base units in the terms of fundamental physical constants to eliminate any artifact on material dependencies. In 2005, in Recommendation 1, the CIPM approved preparative steps towards new definitions of the kilogram, the ampere, the Kelvin and the mole in terms of fundamental constants [1, 2]. The unit of temperature, the Kelvin, can be defined in terms of the SI unit of energy, the joule, by fixing the value of the Boltzmann constant k which is simply the proportionality constant between temperature T and thermal energy kT [3]. The new definition would be in line with modern science where nature is characterized by statistical thermodynamics, which implies the equivalence of energy and temperature as expressed by the Maxwell-Boltzmann equation. The Boltzmann constant k is not connected with the other fundamental constants, there are no alternatives to the linking of the Kelvin aside from the exact value of the constant k. In practice, no universal instrument for measuring energy exists while energy appears in different forms, e.g. temperature. Currently, several experiments are underway to determine k using primary thermometers of different types [3, 4]. From the point of view of practical thermometry it is necessary to determine what uncertainty in the measured value of k is needed to apply it as the temperature unit. It would be of the order in the present realization of the triple point of water: ≈ 1.8×10-7. At present its uncertainty is about one order of magnitude higher.

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2008
• Tom: Vol. 15, nr 2
• Strony: 227--234
• Opis fizyczny: Bibliogr. 22 poz., tab.

Twórcy

autor

Lipiński L.

autor

Szmyrka-Grzebyk A.

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław,

Bibliografia

• 1. Recommendation 1 (CI-2005): Preparative Steps Towards New Definitions of the Kilogram, the Ampere, the Kelvin and the Mole in Terms of Fundamental Constants - CIPM, Sevres, 2005.
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• 14. Fellmuth B.,Wolber L., Hermier Y., Pavese F., Steur P. P. M., Peroni I., Szmyrka-Grzebyk A., Lipinski L., Tew W. L., Nakano T., Sakurai H., Tamura O., Head D., Hill K. D., Steele A. G.: “Isotopic and other influences on the realisation of the triple point of hydrogen”, Metrologia, vol. 42, 2005, pp. 171-193.
• 15. Pavese F., Fellmuth B., Head D., Hermier Y., Sakurai H., Steele A. G., Szmyrka-Grzebyk A., Tew W. L.: “Proposal of amendement of the ITS-90 definition concerning the triple point of equlibrium hydrogen”, Document BIPM – CCT/01-07, 21 Meeting of the CCT, BIPM, Paris 2001.
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• 19. Lipinski L., Kowal A., Szmyrka-Grzebyk A., Manuszkiewicz H., Steur P. P. M., Pavese F.: “The triple point of nitrogen”, Metrologia, vol. 43, 2006, pp. 435-440.
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