(adhesion to a surface)
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 not involving chemical bonding or reconfiguration, generally caused by a van der Waals force, which is a type of weak force between molecules, that can draw them together without reconfiguring them into different molecules.
- chemisorption - adsorption that does involve a chemical reaction between the components, i.e., formation of new molecules through covalent or ionic bonds, i.e., sharing or transferring electrons.