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This paper presents results of the ultrasonic velocity measurements in the temperature range 291-303 K and absorption coefficient measurements in the frequency range 5-43 MHz and temperature range 0.15=<T-T c =<20 K in the benzonitrile-isooctane critical mixture. Ferrell and Bhattacharjee dynamic scaling theory which predicts a linear dependence between α c /f 2 and f...