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Freundlich, in 1909, gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. The relationship can be expressed by the following equation

$\dfrac{X}{m} = KP\dfrac{1}{n}$

Where x is the mass of the gas adsorbed on mass m of the adsorbent at pressure P, k and n are constants which depend on the nature of the adsorbent and the gas at a particular temperature. The relationship is generally represented in the form of a curve where mass of the gas adsorbed per gram of the adsorbent is plotted against pressure.

$log\dfrac{x}{m} = \dfrac{1}{n}logp + logk$

Freundlich isotherm explains the behaviour of adsorption in an approximate manner. The factor $\dfrac{1}{n}$ can have values between 0 and 1