Speeds of sound in CF4 between 175 and 300 K measured with a spherical resonator

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Abstract
An apparatus is described that exploits the high precision of a spherical resonator in the temperature range 80 to 350 K at pressures up to 1.3 MPa. We have used the radial modes of the spherical resonator to measure the speed and absorption of sound in CF4 in the temperature range 175 to 300 K and the pressure range 0.08 to 1.0 MPa. The speeds of sound, which have a precision better than 0.001% have been used to obtain perfect‐gas heat capacities and second and third acoustic virial coefficients of CF4. (p,V,T) virial coefficients calculated from the results are in good agreement with those in the literature. We also report vibrational relaxation times for CF4 determined from the linewidths of the radial modes.