A graph between x/m and the pressure P of the gas at a constant temperature is called…

A graph between x/m and the pressure P of the gas at a constant temperature is called adsorption isotherm. Where x is the no. of moles of the adsorbate and m is the mass of the adsorbent. Adsorption isotherms of different shapes have been experimentally observed. According to Fruendlich adsorption isotherm.
x/m = kP^1/n
where k and n are constant parameters depending upon the nature of the solid and gas.
Adsorption isotherm of \(\log \left(\frac{x}{m}\right)\) and log P was found of the type:
 
\[\log \left(\frac{\mathrm{x}}{\mathrm{~m}}\right) \coprod_{\log \mathrm{P}}\] 
This is true when: