The values of ultrasonic velocity (u), density (), and viscosity () have been measured experimentally in the binary liquid mixture containing 1-butanol and hexane over the entire range of composition at different temperatures 313.15 K, 318.15 K and 323.15 K. This experimental data have been used to calculate the acoustical parameters such as adiabatic compressibility (), free length (L f ), molar volume (V m ) and acoustic impedance(z). The results have been qualitatively used to explain the molecular interactions between the components of the liquid mixture.