![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/CriticalPointMeasurementEthane.jpg/640px-CriticalPointMeasurementEthane.jpg&w=640&q=50)
Critical point (thermodynamics)
Temperature and pressure point where phase boundaries disappear / From Wikipedia, the free encyclopedia
In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve. One example is the liquid–vapor critical point, the end point of the pressure–temperature curve that designates conditions under which a liquid and its vapor can coexist. At higher temperatures, the gas cannot be liquefied by pressure alone. At the critical point, defined by a critical temperature Tc and a critical pressure pc, phase boundaries vanish. Other examples include the liquid–liquid critical points in mixtures, and the ferromagnet–paramagnet transition (Curie temperature) in the absence of an external magnetic field.[2]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/CriticalPointMeasurementEthane.jpg/640px-CriticalPointMeasurementEthane.jpg)