The adsorption of 1-butanol and 1-hexanol vapors on various solid samples was investigated in relation to the gradient of the linear portion of Type II isotherms. The adsorption isotherms of the medium-sized normal alcohol vapors were classified as either typical Type II or those resembling Type I isotherms. The former were shown by samples of gold, aluminum, and graphite, and the latter by samples of alumina, sodium chloride, and silicate glass. BET surface areas and "gradient method" surface areas by these alcohol adsorbates were estimated for each solid sample, and from the latter, excess entropy of adsorbed molecules of the alcohol adsorbates was estimated by the gradient method theory for surface area measurement. Excess entropy showed that the molecules adsorbed on gold in the multilayer region had almost the same kinetic freedom as the molecules in the liquid state and showed the applicability of the gradient method to this kind of solid. Excess entropy of adsorption also showed that the molecules on alumina, sodium chloride, and porous silica glass had less kinetic freedom than the liquid-state molecules by the entropy reduction of 25 to 30% compared to the solidification entropy change.