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The refractive indices and densities of binary mixtures of tetrahydrofuran (THF) with 1-propanol (1-P) and 2-propanol (2-P) over the entire composition range have been measured at 293, 303 and 313 K. Refractive index and density data have been used to evaluate the molar refraction deviation ÁR m and excess molar volume V E m . The values of ÁR m and V E m are negative for THF þ 1-P mixture and are positive for THF þ 2-P mixture. This suggests that specific interactions are taking place in THF þ 1-P mixture while dispersive forces are responsible for behaviour of THF þ 2-P mixture.