Page 81 - Gas Adsorption Equilibria

1. Basic Concepts 67

Here is the specific polarizability of the sorbate within the sorbent/sorbate
system considered.

Similarly, the change in enthalpy of sorbate phase upon desorption

can be measured in a calorimeter, cp. [1.3] and Chap. 2, Sect. 5. It also is a
quantity of state, i. e. can be represented as

In view of the extensivity property of this quantity we also have

with being the specific enthalpy of desorption of the adsorbate.

From the specific polarizability of the sorbate

a representation of the pressure (p) as a function of T, can be
derived, i. e. we have

Inserting this function in (1.54) we get

which in view of (1.51), the relation can be written as