John J. Hurly
Steven J. Boyes
James W. Schmidt
Natl. Inst. of Standards and Technol., Thermophys. Div., Gaithersburg, MD 20899
The equation of state and the speed of sound have been measured for helium, xenon, and three helium--xenon mixtures in the temperature and pressure ranges of interest for designing thermoacoustic refrigerators. The results have been correlated with a virial equation of state and can be used to optimize the refrigerator designs. [Work supported by the Office of Naval Research.]