New measurement of the Boltzmann constant k by acoustic thermometry of helium-4 gas

@article{Pitre2017NewMO,
  title={New measurement of the Boltzmann constant k by acoustic thermometry of helium-4 gas},
  author={Laurent Pitre and Fernando Sparasci and Lara Risegari and C{\'e}cile Guianvarc'h and C Martin and Marc Himbert and Mark Plimmer and Adrien Allard and Benoit Marty and P. Alberto Giuliano Albo and Bo Gao and Michael R Moldover and James B. Mehl},
  journal={Metrologia},
  year={2017},
  volume={54},
  pages={856-873}
}
The SI unit of temperature will soon be redefined in terms of a fixed value of the Boltzmann constant k derived from an ensemble of measurements worldwide. We report on a new determination of k using acoustic thermometry of helium-4 gas in a 3-litre volume quasi-spherical resonator. The method is based on the accurate determine of acoustic and microwave resonances to measure the speed of sound at different pressures. We find for the universal gas constant R = 8.31 44614 (50) Jmol-1K-1. Using… 
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TLDR
The first experimental results of temperature control for this cryostat were presented and the ultra-high precision temperature control in the range of 5-25 K has been fully realized, which was the temperature instability of 0.022 mK at 25 K, almost the best reporting result in the world and showed its great potential in SPRIGT.
The Boltzmann project.
TLDR
With the redefinition of the kelvin, the broad research activities of the temperature community on the determination of the Boltzmann constant have been very successfully completed.
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