EXPLANATION OF THE PROCESSES OF MELTING, BOILING, EVAPORATION OF A SUBSTANCE FROM THE PHYSICAL MODEL OF THE MOLECULAR-ENERGY UNPACKING OF A SUBSTANCE

In the article, based on the molecular energy model of unpacking of a substance, a unified energy approach to the processes of melting, boiling and evaporation of a substance is considered. Based on such a model, the relationship between the melting point, boiling point and critical point for a substance was found in terms of energy change. The theoretical correlation of each of those temperatures with the latent heat of fusion, internal energy, enthalpy of vaporization was shown. The results of the correlation were brought up to calculation formulas. The obtained formulas were confirmed by data from reference books and known empirical dependencies. Thus, with the help of the substance unpacking model, one more confirmation of the unified connection between the phenomenon of surface tension, processes of surface melting, melting in volume, surface boiling, boiling in volume, and evaporation was found