$\mathrm{Na}_2 \mathrm{SO}_4$

$\mathrm{CaCl}_2$

$\mathrm{NH}_4 \mathrm{Cl}$

$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$

$\frac{x}{m}=k_p^{1 / n}(n>1)$

Extent of adsorption of gas is more at high temperature than at low temperature

$\frac{1}{n}$ represents the slope of the isotherm

$\log \frac{x}{m}=\log k+\frac{1}{n} \log p$ holds good over a limited range of pressures