Experimental results on adsorption equilibrium

Adsorption thermodynamics and chemisorption equilibrium 6.2.1. Experimental results on adsorption equilibrium 

Because the bond between gas and the surface of the solid is of a chemical nature, it generally results in a monolayer of gas at the maximum adsorptioa 

The amount of chemically absorbed gas can be represented either by the volume that this amoimt would occupy in a gas state under the normal conditions of pressure and temperature or by the amount (mole numbers) of adsorbed gas. These two quantities are generally brought back to the unit area of the solid surface. 

However, as chemisorption is in general limited to a monolayer, we very often choose the fraction of covering 0 (or filling degree) of the surface. At a given time, this is the ratio of the amount of adsorbed gas to the total amount to obtain the monolayer. At equilibriirm, that is, at the end of a theoretically infinite time, this ratio will be 6.  

The experiment shows that chemisorption is a divariant phenomenon the amount of gas adsorbed at equilibriirm is a function of the gas pressure and temperature. 

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