Physicochemical parameters for adsorption of gases at the submonolayer regions of heterogeneous solid surfaces are measured experimentally as a function of time, and then interrelated as local isotherms θ against adsorption energy ε, fractional changes of adsorption sites f(ε)/c* max against ε, θ against f(ε)/c* max , and distribution functions θ f(ε)/c* max over adsorption energy values ε, without using at all the well-known integral equation Θ(p, T)=∫ ∞ 0 θ(p, T, ε)f(ε)dε and assumptions concerning the pair f(ε) and θ(p, T, ε). The method uses only chromatographic experimental data obtained by the inverse gas chromatography technique known as reversed-flow gas chromatography. It has been applied to the adsorption of cis-2-butene and trans-2-butene onto particles of Penteli marble at temperatures of 302, 314, 323, and 333 K. The results obtained are comparable with those calculated on the basis of the well-known integral equation.