Abstract: Partial molal volumes of ethanol, cyclohaxane, trichloromethane, toluene, acetone, carbon tetrachloride, acetonitrile, DMF, and DMSO in methanol, benzene, and their mixtures at infinite dilution at 298.15 K were determined with density measurement. The concentration of solutes for density measurement is in the range from 0.2 to 1.5 mol·kg~(-1) solvent. The compositions of methanol-benzene mixture lay between mole fraction 0 and 1. Variation of solute partial molal volumes with composition of methanol-benzene mixture was attributed to several aspects of molecular interaction, i.e. physical type interaction among three kinds of molecules; hydrogen bond asociation between solute and methanol molecules; and weak complex between solute and methanol or benzene.