Abstract
A fixed-pathlength variable-frequency ultrasonic interferometer based on a cylindrical resonator has been constructed. Measurements of the speed of sound in argon and krypton in the range 250 to 330 K and 20 to 100 kPa have been used to determine the acoustic pathlength. The acoustic virial coefficients are in good agreement with values obtained from the integration of pair potential-energy functions.
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