| Abstract |
Absolute measurements of the thermal diffusivity of liquid toluene were performed by photon correlation spectroscopy between 293 and 523 K near the saturation line. The experimental method is based on a time-resolved analysis of the laser light scattered from local equilibrium fluctuations in a transparent sample, enabling us to obtain the thermal diffusivity in macroscopic thermodynamic equilibrium. The experimental results are compared with previous data obtained with the same method, with the transient-hot-wire technique, and also with calculated values of thermal diffusivity from reference data for thermal conductivity, heat capacity, and density. They demonstrate an agreement of 2.5\%, which is within the uncertainty of the reference data. |
