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The BET equation rearranged in the form [
V(1
−
P)]/
P
=
CV
m
−
(
C
−
1)[
V(1
−
P)] was used for the calculation of specific surface areas of porous catalysts and the variation of
C-term during the progress of adsorption. This novel method employs plots of [
V(1
−
P)]/
P vs. [
V(1
−
P)] which provide inclined-
V type lines with an inversion point termed I-point. This I-point corresponds exactly to
V(1
−
P)
=
V
m, i.e., the volume of nitrogen necessary for the formation of a monolayer. The slope of the plots corresponds to (
C
−
1) from which the values of
C can be estimated in the whole range 0
<
P
<
1. As the I-point is approached, the
C values approach the
C
BET values calculated from the classical linear BET plots. The free energy of adsorption in the whole range 0
<
P
<
1 can be also estimated from the relationship
RT
ln
C.