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Thermodynamic data such as the activity coefficient, interaction coefficient and excess free energy are regarded as important guidelines for determining the direction of actual operations in various kinds of high-temperature metal production processes. This is because thermodynamic data elucidate the reactions of liquid state substances and the phenomena occurring between them. Therefore, the thermodynamic data in the liquid Fe system related to the removal of impurities and inclusions have been actively obtained in the steelmaking process for steel production.1,2) Many types of models exist for calculating the physicochemical properties, which are the control factors in high-temperature processes. Models for liquid alloy surface tension and viscosity based on thermodynamic data have been developed as the thermodynamic database is improved, and the construction of a calculation system based on this thermodynamic database has progressed.3–8) In particular, a calculation method based on Butler’s equation for the surface tension of a liquid alloy via activity has been proposed by Speiser et al.,10) and is considered a good model that correlates well with the measured value. Thus, it is no exaggeration to state that this model sufficiently associates the thermodynamic data to the surface tension for a liquid alloy. From this viewpoint, Gasior et al.11) reported a method for calculating the excess free energy from the surface tension of a liquid alloy using the previous method (i.e., calculating the liquid alloy surface tension based on the thermodynamic data) in the opposite Estimation of Activity Coefficient of Solute in Infinite Dilute Liquid Iron Based on Surface Tension of Binary Liquid Fe Alloys