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Hildebrand Solubility Parameter

A measure of the cohesive energy density of a solvent, correlating with its ability to dissolve solutes.
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The statement of the theorem

Define the Hildebrand solubility parameter δ\delta (in MPa1/2\text{MPa}^{1/2}) as the square root of the cohesive energy density (EcohE_{coh}) of a pure substance: \nδ=Ecoh\delta = \sqrt{E_{coh}} \nFor two components, the limit of miscibility is approached when the difference in their solubility parameters is minimized, i.e., Δδ=∣δ1−δ2∣→0\Delta \delta = |\delta_1 - \delta_2| \rightarrow 0.
Source: Wikipedia