van der Waals force

The van der Waals equation is an equation of state that can be derived from a special form of the potential between a pair of molecules (hard-sphere repulsion and R-6 van der Waals attraction). In chemistry and physics, the name van der Waals force is sometimes used as a synonym for the totality of non-covalent forces (also known as  intermolecular forces). These forces, which act between stable molecules, are weak compared to those appearing in chemical bonding. Historically, the use of the name for the total force is correct, because the Dutch physicist J. D. van der Waals, who lent his name to these forces, considered both the repulsive and the attractive component of the intermolecular force.
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A force acting between nonbonded atoms or molecules. Includes dipole-dipole, dipole-induced dipole, and London forces.