ABSTRACTIt has been indicated that because of the assumption that E2= ELused in its derivation the B.E.T. infinite layer equation cannot describe adsorption beyond the first adsorbed layer. A simplification of the three constant B.E.T. equation provides a new monolayer equation which agrees more with the above assumption from which the Langmuir equation is shown to arise as a special case at low pressures. The monolayer capacity predicted by the new monolayer equation appears to maintain a more stable product than is possible with the classical B.E.T. infinite layer equation. The use of the new equation in sorption studies is recommended.
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