High Quality Content by WIKIPEDIA articles! The Langmuir adsorption model is the most common model used to quantify the amount of adsorbate adsorbed on an adsorbent as a function of partial pressure or concentration at a given temperature. It considers adsorption of an ideal gas onto an idealized surface. The gas is presumed to bind at a series of distinct sites on the surface of the solid as indicated in Figure 1, and the adsorption process was treated as a reaction where a gas molecule reacts with an empty site, S, to yield an adsorbed complex