Abstract
1. From the experimental data for gaseous and highly expanded monolayers on liquid and solid surfaces, the second virial coefficients were calculated, and the temperatures at which the interface ceases to be a good “two-dimensional solvent” (θ) were determined. 2. The condensation of each two-dimensional state of the same monolayer is characterized by its own θ-temperature. 3. An equation of state was proposed for the highly expanded monolayer, and expressions were obtained for the calculation of the enthalpy and entropy of spreading of monolayers from the molecular constants. 4. Under the condition of the existence of one state of the monolayer, values were obtained for the enthalpy and entropy of contact interaction of molecules of the monolayer with the substrate at the point.
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