Freundlich Adsorption Isotherm (x/m = k p^(1/n))
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x/m = k p^(1/n)
What each symbol means
| Symbol | What it stands for |
|---|---|
| k | Empirical constant (depends on T and nature of adsorbent–adsorbate pair) |
| n | Empirical constant (>1 typically); related to intensity of adsorption |
| p | Equilibrium pressure of the adsorbate gas (or concentration for solutes) |
| x/m | Mass of adsorbate adsorbed per unit mass of adsorbent at equilibrium |
When to use this
Empirical isotherm for gas adsorption on solids at moderate pressures; not valid at very low or very high p where monolayer/multilayer limits appear. Often written with concentration c instead of p for solutions: x/m = k c^(1/n).