What is adsorption isotherm? Describe Freundlich adsorption isotherm

Adsorption isotherm:

The variation of the mass of the gas or adsorbate adsorbed per gram of the adsorbent varies with pressure and temperature at constant temperature, which is referred to as the adsorption theorem.

Freundlich adsorption isotherm:

At a given temperature, the Freundlich adsorption isotherm is a mathematical depiction of the fluctuation in adsorption extent (x/m) with pressure (p).

The mass of the adsorbent is m, while the mass of the adsorbate is x.

The expression for it is (x/m) = k x P ^1/n

Hence, the variation of the mass of the gas or adsorbate adsorbed per gram of the adsorbent varies with pressure and temperature at constant temperature, and it is referred to as the adsorption theorem.

The expression for Freundlich adsorption isotherm is (x/m) = k x P ^1/n