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E-mail: shlee@ks.ac.krReceived October 17, 2011, Accepted November 17, 2011A test-area molecular dynamics simulation method for the vapor-liquid interface of argon through a Lennard-Jones intermolecular potential is presented in this paper as a primary study of interfacial systems. We foundthat the calculated density profile along the z-direction normal to the interface is not changed with time afterequilibration and that the values of surface tension computed from this test-area method are fully consistentwith the experimental data. We compared the thermodynamic properties of vapor argon, liquid argon, andargon in the vapor-liquid interface. Comparisons are made with kinetic and potential energies, diffusioncoefficient, and viscosity. Key Words : Vapor-liquid interface, Test-area method, Surface tension, Molecular dynamics simulationIntroductionInterfacial systems are of considerable interest to bothnature and practical technologies. An understanding of inter-faces and inhomogeneous systems is essential to all areas ofindustrial processes. For example, the surface tension bet-ween a liquid and its vapor or two coexisting liquids is ofcentral importance in understanding capillary rise and thesolubilization of immiscible fluids. It is therefore natural that molecular theories of inhomo-geneous systems are now well developed,

Vapor-liquid Interface of Argon by Using a Test-area Simulation Method