Molar solubility dimensionless

Remember that although equilibrium calculations require concentrations in molarities for solutes, the equilibrium constant expression is dimensionless. The solubility product has a... 

There have been many attempts to describe the process of mixing and solubility of polymer molecules in thermodynamic terms. By assuming that the sizes of polymer segments are similar to those of solvent molecules, Flory and Huggins derived an expression for the partial molar Gibbs free energy of dilution that included the dimensionless Flory Higgins interaction parameter X = ZAH/RT, where Z is the lattice coordination number. It is now... 

Solubility of some substances in the supercritical fluids, among different parameters, mostly depends on the vapor pressure, the substance polarity, and substance molar mass. Compounds of smaller molar mass and a higher vapor pressure at supercritical condition are more soluble in SFs, compared to other with lower vapor pressure and higher molar mass. An enhancement factor (dimensionless parameter) is defined as the ratio of solubility of substances in the SF (solvent) compared to its solubility in the ideal gas. Usually, this parameter has the common value between 10" and 10 [3]. Different mechanisms reported in the literature have been used for explaining the enhancement of solute solubility in supercritical fluids. They included the hydrogen bonding, the charge transfer complex formation, dipole-dipole noninduced and induced interactions, and solute-solvent with and without cosolvent interactions. 

This dimensionless interaction parameter characterizes the interaction energy per solvent molecule normalized in terms of kT. Assuming that the molar volume of the solvent is almost independent of temperature, like the Hildebrand s parameters of solubility for both solvent and polymer. Equation (5.5) can be used to take into account the influence of the temperature of membrane fabrication. 

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