In this paper we review simulation and experimental studies of thermal capillary wave fluctuations as an ideal means for probing the underlying disjoining pressure and surface tensions, and more generally, fine details of the Interfacial Hamiltonian Model. We discuss recent simulation results that reveal a film-height-dependent surface tension not accounted for in the classical Interfacial Hamiltonian Model. We show how this observation may be explained bottom-up from sound principles of statistical thermodynamics and discuss some of its implications.

The thermodynamic properties of CF, and CHF, have been cakuiated from an equation of state of the Strobrldg. type, fitted to extenrlve p-Y-Tdata sets recently publbhed. The thormodynamic properties under saturation condltlons have been compared with previously pubitshed data, the agreement being satisfactory except In the neartrlticai region. The results have been used to dkcusr the performance of a monatomic fluid model, whkh k shown to be unsatisfactory.

A new equation of state is found to reproduce analytically the thermodynamic properties of fluids interacting with a spherical Kihara potential formulated for arbitrary values of the inner hard core. The results from the expressions developed are satisfactorily compared with the Monte Carlo simulation data for a wide range of densities and temperatures. The foundation of the new equation is strictly theoretical, based on the first-order mean spherical approximation perturbation approach of Tang and Lu, and provides a good starting point for the description of polyatomic fluids within the benchmark of Wertheim's first-order perturbation theory of associating fluids.

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