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A sample of n-pentforane, C5F12, of high purity was made available by the operation of the electrochemical process for the production of fluorocarbons. The physical properties of this material were determined, and a study was made of the two-component, liquid-gas system of it with n-pentane, C5H12. Deviations from Raoult's law were found which were much greater than could be predicted by existing theories for solutions of nonpolar substances. In order to correlate the experimentally determined properties of these mixtures, it was necessary to extend the existing theories. This was done by assuming a new concept of possible significance in solubility relationships. This concept is pictured as the interpenetration of the molecules in the condensed state. For the particular system herein studied the interpenetration between hydrocarbon molecules is much greater than between fluorocarbon molecules, and the interpenetration between the fluorocarbon and hydrocarbon molecules is as small or smaller than that between fluorocarbon molecules. This additional concept has provided a means for correlating the measurements.

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