The surface tension of ionic liquids is studied according to phenomenological scaling and the law of corresponding states. The reduced coordinates g*-T*, where g* represents the reduced surface tension and T* is the reduced temperature, are introduced for the prediction of the surface tension from the melting point up to boiling point. It has been shown that the correlation can be expressed as a unique straight-line plot with a linear correlation coefficient of 0.984 that requires only the melting and boiling point parameters and can predict the surface tension accurately.
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