In
physics,
chemistry, and
biology, intermolecular forces are forces that act between stable
molecules or between functional groups of
macromolecules. These
non-covalent forces, which give rise to bonding energies of less than a few kcal/mol, are generally much weaker than the
chemical bonding forces. Nevertheless, intermolecular forces are responsible for a wide range of physical, chemical, and biological phenomena. For instance, they play a role in the deviation from the
ideal gas law for real gases, the
tertiary structure of
macromolecules and signal induction in
neurotransmitters.
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An attraction or repulsion between molecules. Intermolecular forces are much weaker than chemical bonds.