Critical point (thermodynamics)

In thermodynamics, a critical point refers to the specific temperature and pressure at which the properties of a substance's liquid and vapor phases become indistinguishable. At this point, the distinction between the liquid and gas phases vanishes, resulting in a single phase known as a supercritical fluid. The key characteristics of the critical point are: 1. **Critical Temperature (Tc)**: This is the maximum temperature at which a substance can exist as a liquid.