What Units are Used for Hansen Solubility Parameter?

[Pen Rie]

For those of you who know what a Hansen Solubility Parameter is, does the "hydrogen-bonding" part means the actual hydrogen bond energy between molecules? I'm confused as to why they used mPa^0.5 instead of kJ/mol^-1 for measurement.

 

[Bystander]

"MPa^0.5?" Or, "sqrt(MPa)?" Hansen identified three factors to consider for predictions of solubilities. He assigned units of square root of pressure to them to add them in quadrature. Activities/fugacities of solutes and solvents that do not dissociate when mixed to form a solution can be expressed in units of pressure, or as ratios of pressures. Actual energies? No. Proportional to energies of the interactions? Yes.