begin mathsize 36px style theta equals fraction numerator K subscript e q end subscript P over denominator 1 plus K subscript e q end subscript P end fraction end style

Keq = Equilibrium Constant of Adsorbtion;  P = Partial Pressure or Concentration of the absorbate;  θ = The fraction of adsorbent surface covered by adsorbate





The Langmuir Isotherm describes a absorbate absorbent system  in which the extent of adsorbate coverage is limited to one molecular layer. This isotherm describes Chemisorption. It is to be noted that concentration of absorbate can be used in this equation instead of partial pressure. In that case the unit must be changed to mole/L.

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