Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. \(\frac{x}{m}\) is proportional to
1
\({\rm{\;}}{{\rm{P}}^{\frac{1}{4}}}\)
2
P2
3
P
4
\({{\rm{P}}^{\frac{1}{2}}}\)