Adsorption isotherm; Adsorption isotherms have played a critical role in studies of environmental protection and adsorption strategies. The Freundlich and Langmuir isotherms are the two most used approaches for predicting a material's adsorption capacity. At a constant temperature, the Freundlich adsorption isotherm graph is a graph that depicts the fluctuation in the amount of adsorbate(x) adsorbed on the surface of the adsorbent as a function of pressure. The direction of equilibrium in a reaction varies in the direction that stress is relieved, as we know from Le Chatelier's principle. As a result, we can see that when the system is subjected to excessive pressure, the equilibrium moves in the direction of fewer molecules, lowering the pressure in the system.