Interactions between the surfactant (CTAB) and amino acid (valine) were investigated using density and viscosity data. These data were utilized to calculate apparent molar volume, fv, and partial molar volume also known as limiting molar volume f0v and these parameters were further used to find out solute-solvent interactions between amino acid and surfactant at 298.15, 303.15, 308.15 and 313.15 K temperatures.