Temperature Dependence of the Speed of Sound, Densities, and Isentropic Compressibilities of Hexane + Hexadecane in the Range of (293.15 to 373.15) K

The speed of sound u and density ρ for the binary mixture hexane + hexadecane has been measured as a function of composition and temperature along the saturation line between 293.15 K and 373.15 K. The speed of sound was measured by a pulse-phase echo ultrasonic device at a frequency of (1 to 5) MHz with an uncertainty of ±0.1%. The density was measured by an Ostwald−Sprengel-type pycnometer with an uncertainty of ±3 × 10-5 g·cm-3. The experimental results were used to calculate deviations of the speed of sound Δu, excess molar volume VE, and isentropic compressibility kS. The values Δu and VE were fitted by the Redlich−Kister equation.