Phase transition in system of bound atoms with pair interaction

A statistical analysis is made for a bulk system of bound classical. atoms with a pair interaction between atoms. Excitation of this system results in :formation of vacancies or voids, so that the excited state is represented as agas of interacting vacancies, and vacancy parameters depend on the exci tation degree. The scaling: laws or parameters of condensed rare gases, whi ch are the systems under consideration, give additional information for the microscopic nature of the liquid phase state.