Shear Viscosity and Ultrasonic Absorption near a Plait Point in the Ternary System Water-Benzene—Ethyl Alcohol

The kinematic shear viscosity and the ultrasonic absorption coefficient have been measured in the ternary system water-benzene—ethyl alcohol near a critical point ("plait point") ($P_c=1\mathrm{}$ atm; $T_c=25\mathrm{}°$C; critical composition in wt%: water, 10.25; benzene, 52.10; and ethyl alcohol, 37.25), to provide a qualitative test of recent theoretical predictions. The experimental results indicate a rapid increase of the shear viscosity as a function of concentration near the plait point and a less pronounced sensibility of the absorption coefficient.