Freundlich Adsorption Isotherm
It gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbent and pressure at a particular temperature. It can be expressed by the equation.
x / m = kp 1 / n …( i)
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.
At low pressure, n = 1, i. e., x / m = kp At high pressure, n > 1, i. e., x / m = k( independent of p)
Taking logarithm of Eq.( i)