An adsorption isotherm (also called sorption isotherm) describes the equilibrium adsorption of a material on a surface (more generally on a boundary surface) at a constant temperature. It represents the amount of material bound to the surface (the sorbate) as a function of the material present in the gas phase or in the solution. Adsorption isotherms are often used as experimental models, which make no assertions about underlying mechanisms and measured variables. They are obtained from measurement data by means of regression analysis. Types
The most frequently used isotherms are:
wiki
