Text: "The negative gradients of the potential energy V between two interacting molecules, V being a function of the distance R between the centers of the two molecules. The intermolecular forces are thus repulsive in the region where V decreases with R. Intermolecular forces are conveniently divided into two classes, short-range forces and long-range forces. The former are confined to a region of about 3 A; the latter act beyond that distance."

See Also: SYMPATHETIC NEGATIVE ATTRACTION

Source: 3