We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical properties of helium ab intio suggest that today one could determine Boltzmann's constant kB from acoustic measurements using either helium or argon with a relative uncertainty less that 10-6.
Citation: Comptes Rendus De L Academie Des Sciences Serie II Fascicule B-Mecanique Physique Astronomie
Pub Type: Journals
acoustics, acoustic resonators, acoustic thermometry, Boltzmann constant, fundamental constants, resonators, speed of sound, thermometry