Supercritical liquid–gas boundaries

Supercritical liquid-gas boundaries refer to the phase boundary that exists in a substance when it is subjected to conditions above its critical temperature and critical pressure. At these conditions, the substance enters a supercritical state, where distinct liquid and gas phases do not occur. ### Key Concepts: 1. **Critical Point**: This is the specific point on a phase diagram for a substance where the temperature and pressure are so high that the liquid and gas phases become indistinguishable.