The reverse of adsorption is desorption. The condition when the rates of adsorption and desorption are equal is called the adsorption equilibrium. In a state of equilibrium, the number of adsorbed molecules remains constant so long as the external conditions-pressure, temperature, composition of the system - remain unaltered.
In practice, adsorption is widely used for the concentration of substances and gas and liquid purification. Adsorption methods of analysis are used to determine the specific surface area of solids and to evaluate the size of applied particles (including nano scale) on the surface of a carrier, etc.
- Saranin Alexander A.
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