Adsorption is the adhesion of the atoms or molecules
of a substance to a surface. The substance can
be gas, liquid, or dissolved solid.
Two classes are:
- Physisorption - Adsorption where the electronic structure of the atom or molecule remains, generally caused by Van Der Waals Force, force between molecules not from a Covalent Bond or Ionic Bond (sharing or transferring electrons).
- Chemisorption - Adsorption involving a chemical reaction between the components.