Corresponding states correlation for the surface tension of molten alkali halides
Mohammad H Ghatee, Mohammad H Mousazadeh, Ali Boushehri
Surface tension, among other physical and thermodynamic properties of liquids and molten alkali halides, is a basis for practical and theoretical modelling of the liquid state of matter. According to phenomenological scaling and consideration of the law of corresponding states, reduced coordinates s* – T*, where s* is the reduced surface tension and T* is the reduced temperature, are introduced for the prediction of the surface tension of alkali halides. In the correlation, the melting temperature is used as the corresponding temperature for the different alkali halides. The relationship in which T* is a scaled distance from the boiling point, Tb, is applied accurately to molten alkali halides over an extensive range of temperature. It is observed that s* varies linearly with T* in the form s* = a +bT*, where a and b are constants independent of temperature. This relationship has advantages over its counterpart in the literature. The results on an observed new regularity correlating surface tension to temperature are presented.