de Podesta, M; Sutton, G; Underwood, R; Perkin, M; Davidson, S; Morantz, P* (2011) Assessment of uncertainty in the determination of the Boltzmann constant by an acoustic technique. Int. J. Thermophysics, 32 (1-2). pp. 413-426.

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Abstract

NPL is currently carrying out acoustic resonator experiments with the aim of determining the Boltzmann constant kB with an uncertainty below 1 part in 106. In this paper we describe progress in our efforts to assess the uncertainty in our determination. We consider uncertainty contributions arising from dimensional, chemical, isotopic, thermal and acoustical considerations, and conclude that a measurement with an uncertainty below 1 part in 106 is achievable.

We pay special attention to three areas. Firstly we discuss the design of the resonator and the manufacturing techniques used to ensure that accurate measurements of the resonator's form and dimensions are possible. Secondly we discuss the comparability of resonator dimensions determined by three techniques: dimensional measurements with a coordinate measuring machine; pyknometry using water; and a microwave technique. Finally we discuss uncertainties in the determination of the impurity and isotopic composition of measurement gas used.

Item Type:	Article
Keywords:	Boltzmann Constant, Primary Thermometry, Acoustic Thermometry, Pyknometry, Pycnometry, Uncertainty
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Identification number/DOI:	10.1007/s10765-010-0897-3
Last Modified:	02 Feb 2018 13:14
URI:	http://eprintspublications.npl.co.uk/id/eprint/4949

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