Thermal Diffusivity and Sound Velocity of Toluene Over a Wide Temperature Range

The thermal diffusivity and the sound velocity of toluene have been determined in a wide temperature range up to the critical point by dynamic light scattering. Measurements were performed for both the liquid and the vapor phase at saturation conditions. The results obtained corroborate the usefulness of the technique for the determination of thermophysical properties. From the lack of reference data for the thermal diffusivity or other properties from which the thermal diffusivity may be derived in the high-temperature range and from deviations of experimental sound velocity data compared to values derived from the currently established equation of state, the need for further experimental investigations on this important reference fluid was established.