Sutton, G J M; Underwood, R J; Pitre, L*; de Podesta, M; Valkiers, S* (2010) Acoustic resonator experiments at the triple point of water: first results for the Boltzmann constant and remaining challenges. Int. J. Thermophysics, 31 (7). pp. 1310-1346.

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Abstract

We report on two sets of isothermal acoustic measurements made with argon close to the triple point of water using a 50 mm radius, thin-walled, diamond-turned quasisphere. Our two isotherms yielded values for the Boltzmann constant, kB, which differ by 0.9 parts in 106, and have an average value of kB = (1.380 649 6 ± 0.000 004 3) × 10-23 J K -1. The relative uncertainty is 3.1 parts in 106 and the average value is 0.58 parts in 106 below the 2006 CODATA value [1] so the values are consistent within their combined (k =1) uncertainties.

Item Type:	Article
Keywords:	Boltzmann Constant, Acoustic Resonance, Microwave Resonance, Quasisphere, Kelvin redefinition
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Last Modified:	02 Feb 2018 13:15
URI:	http://eprintspublications.npl.co.uk/id/eprint/4792

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