For
chemisorption the amount of
adsorbate which is needed to occupy all adsorption sites as determined by the structure of
the
adsorbent and by the chemical nature of the absorptive. For
physisorption, the amount needed to cover the surface with a complete
monolayer of atoms or molecules in close-packed array, the kind of close packing having to
be stated explicitly when necessary.
Source:
PAC, 1972, 31, 577
(Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix
II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry)
on page 587
PAC, 1976, 46, 71
(Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix
II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II:
Heterogeneous Catalysis)
on page 75