Developments in Phase Diagram and Phase Transitions

Abstract

A phase diagram is a graphical representation of the physical states of a substance under different pressure and temperature conditions based on experimental data. In this study, the temperature and pressure-dependent limit range of the liquid phase, critical pressure, critical density, and the position of the plasma, which are not included in the one-component system conventional phase diagram, are discussed. There is only one critical point where the liquid–gas equilibrium curve, which is characterized by individual values of critical parameters for each substance, ends. The two-phase state on the pressure and temperature-dependent liquid–vapor equilibrium curve disappears at this critical point. This point is represented by the critical temperature, critical pressure, and critical density.