Speed of sound measurements and derived third and fourth acoustic virial coefficients of supercritical neon
Publication date
2024-07-11
Document type
Forschungsartikel
Author
Organisational unit
Publisher
Institute of Physics Publishing (IOP)
Series or journal
Metrologia
ISSN
Periodical volume
61
Periodical issue
4
Article ID
045007
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Abstract
We report comprehensive and accurate measurements of the speed of sound in neon. These measurements were carried out by a double-path-length pulse-echo technique and cover the temperature range between 200 K and 420 K with pressures up to 100 MPa. The standard uncertainties are 1.9 mK in temperature, 22 parts in 10^6 in pressure and 35 parts in 10^6 in speed of sound. The third and fourth acoustic virial coefficients of neon were derived from the speed of sound data in the temperature range of the measurements by fitting a fourth-order acoustic virial expansion in pressure with the second acoustic virial coefficient constrained from first-principles calculations. To support our claimed uncertainty, we determined the ratio M/γ_0 between the molar mass M and the ideal-gas heat capacity ratio γ_0 of the neon sample with a relative standard uncertainty of 7.7 parts in 10^6 by additional speed of sound measurements using a spherical resonator at 273.16 K.
Description
Original Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Cite as
Metrologia 61 (2024) 045007 (19pp)
Version
Published version
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