Speeds of sound and isentropic compressibilities for binary mixtures of 1,2-ethanediol with 1-butanol, 1-hexanol, or 1-octanol in the temperature range from 293.15 to 313.15Â K

► The excess molar isentropic compressibilities ΚSE were calculated. ► Mixtures of 1,2-ethanediol with 1-butanol, or 1-hexanol, show ΚSE < 0 over the whole composition and temperature range. ► For mixtures of 1,2-ethanediol with 1-octanol, the s-shaped ΚSE dependencies are observed. ► The rigidity in mixtures under test increases from 1-octanol to 1-butanol. ► In all cases the non-ideality increases with increasing temperature.