The temperature dependence of the absorption at critical composition and above critical temperature Tc for the binary mixture nitro ethane-isooctane at 5, 7, 10, 15, 21, and 25 MHz frequencies is plotted. The frequency dependence of the absorption (αf-2) for the same critical binary mixture at different temperaturesabove critical temperature is shown. In addition, the linear relation of (α f-2) versus