Open AccessMeasurement of the universal gas constant R using a spherical acoustic resonator
Author(s) -
Michael R. Moldover,
J. P. Martin Trusler,
Thomas J. Edwards,
James B. Mehl,
Richard Davis
Publication year - 1987
Publication title -
the journal of the acoustical society of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.619
H-Index - 187
eISSN - 1520-8524
pISSN - 0001-4966
DOI - 10.1121/1.2024984
Subject(s) - speed of sound , resonator , argon , acoustics , acoustic resonance , radius , standard deviation , mercury (programming language) , sound pressure , materials science , constant (computer programming) , resonance (particle physics) , physics , atomic physics , optics , mathematics , computer science , statistics , computer security , programming language
A spherical acoustic resonator has been used to redetermine the universal gas constant R with an uncertainty of 1.8 ppm (standard deviation). To accomplish this, three subtasks were completed. (1) The volume of a spherical shell was determined by weighing the mercury required to exactly fill it at the temperature of the triple point of water, 273.16 K. (2) With the resonator filled with commercially supplied argon, the resonance frequencies of the radial modes were measured as a function of pressure. Using our theoretical model for the cavity, the frequency measurements were combined with the mean resonator radius determined in subtask (1) to obtain the speed of sound in commercially supplied argon. (3) Finally, the speed of sound in the commerically supplied argon was compared to the speed of sound in a “standard” sample whose chemical and isotopic composition was accurately established.
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