Details

The square-well potential is:

The Sutherland potential is:

The Lennard–Jones potential is:

where is the intermolecular potential, is the distance between the molecule centers, is the molecular diameter, is the depth of the potential well, and is the well width for square-well potential.

The attractive strength parameter of the mixture is given by:

,

where is the binary interaction parameter, and and are the attractive strength parameters for molecules and .

A larger negative number for the binary interaction parameter represents stronger interactions between and relative to those between and or and . Analogously, a smaller positive number represents weaker interactions.

The molecular diameter parameter for the mixture is:

,

where and are the diameter parameters for molecules and .

A screencast video at [1] shows how to use this Demonstration.

Reference

[1] Three Intermolecular Potential Models. www.colorado.edu/learncheme/thermodynamics/ThreeIntermolecularPotentialModels.html.