The interfacial tension gamma of a hexane solution of 1,1,2,2-tetrahydroheptadecafluorodecanol CF3(CF2)(7)(CH2)(2)-OH (FC10OH) against water was measured as a function of temperature T and molality m(1) under atmospheric pressure. By the calculation of the interfacial density Gamma(1)(H) and then drawing the interfacial pressure pi vs area per adsorbed molecule A curves, it was concluded that two types of first-order phase transitions take place from the gaseous to the expanded state and from the expanded to the condensed one in the adsorbed film of FC10OH. The partial molar entropy (s) over bar(1)(H) - s(1)(O) and energy changes (u) over bar(1)(H) - u(1)(O) associated with the adsorption were estimated and compared with those of 1,1,2,2-tetrahydrohenicosafluorododecanol CF3(CF2)(9)(CH2)(2)OH (FC12OH). It was found that these values of FC10OH are negative and larger than those of FC12OH. It was suggested that, although both (s) over bar(1)(H) and s(1)(O) values increase, the increment in s(1)(O) is larger than that in (s) over bar(1)(H) when the fluorocarbon chain is lengthened from FC10OH to FC12OH. Furthermore, it was realized that the energetical stabilization of the FC10OH molecule accompanied by adsorption is less than that of the FC12OH molecule. Furthermore, it was shown that the temperature and pressure dependencies of the pi vs A curve are related to the partial molar entropy and volume changes of adsorption, respectively. By estimation of the temperature and pressure coefficients of A at constant pi, it is found that a temperature increase of only 1 K is sufficient to keep pi and A constant upon a decrease of the pressure by 1 MPa.