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Methods for the estimation of the differential molar heat capacity, the difference between the heat capacity of the solid and the liquid form of organic compounds at their melting point ∆c p -(T m ), are presented. Three schemes are considered: the first involves use of group contribution methods for the prediction of solid heat capacity (c p S ) and liquid heat capacity (c p L ); the other two, empirical correlations through the entropy of fusion at the melting point ∆S f (T m ). Recommendations for the different categories of organic compounds are made that provide substantial improvement over the commonly used assumption of ∆c p ) 0, in the prediction of ideal solid solubility and solid vapor pressure.

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