Intermolecular forces are the forces of attraction or repulsion that occur between neighboring particles (atoms, molecules, or ions) in a substance. These forces play a crucial role in determining the physical properties of substances, such as boiling and melting points, vapor pressures, and solubility.
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A force between molecules, including effects of electrostatics, polarizability and London dispersion forces. Hydrogen bonds describe a directional interaction pattern rather than an additional fundamental force to add independently to all those components.