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The Boltzmann project.

J Fischer1, B Fellmuth1, C Gaiser1

  • 1Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin, Germany.

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|May 14, 2019
PubMed
Summary
This summary is machine-generated.

The International Committee for Weights and Measures redefined the kelvin by fixing the Boltzmann constant (k). This ensures highly accurate thermodynamic temperature measurements for all practical applications.

Keywords:
Boltzmann constantInternational System of Units (SI)fundamental constantprimary thermometryrevised SI

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Area of Science:

  • Thermodynamics
  • Metrology
  • Physical Chemistry

Background:

  • The International Committee for Weights and Measures (CIPM) recommended redefining fundamental units.
  • The redefinition of the kelvin involves fixing the Boltzmann constant (k).
  • Accurate determination of the Boltzmann constant is crucial for metrology.

Purpose of the Study:

  • To review recent determinations of the Boltzmann constant (k).
  • To assess the suitability of these determinations for the new kelvin definition.
  • To highlight the successful completion of research activities in temperature science.

Main Methods:

  • Review of experimental and theoretical determinations of the Boltzmann constant (k) from the last decade.
  • Analysis of the uncertainty associated with these determinations.
  • Evaluation of the impact on thermodynamic temperature measurements.

Main Results:

  • The Boltzmann constant (k) will be fixed at 1.380 649 × 10-23 J K-1.
  • The redefinition allows for a relative standard uncertainty of 3.7 × 10-7 for the triple point of water.
  • This level of uncertainty (0.10 mK) is sufficient for all practical purposes.

Conclusions:

  • The redefinition of the kelvin is a significant advancement in metrology.
  • Research on Boltzmann constant determinations has successfully concluded.
  • The new definition ensures stable and accurate thermodynamic temperature measurements.