ABSTRACT
In addition to the well-known forces that originate from interactions in straight lines between centers of particles such as electrostatic interactions of charged or dipolar molecules, there are forces of another type that act like a gravitational force between all atoms and molecules such as helium, carbon dioxide, and hydrocarbons. These forces are generally called dispersion forces. They include London force, charge fluctuation forces, electrodynamic forces, and induced dipole-induced dipole forces. The term "dispersion force" comes from their relation to the dispersion of light in the visible and UV regions of the spectrum.
