critical pressure, \(p_{\textrm{c}}\)

https://doi.org/10.1351/goldbook.C01397
The minimum pressure which would suffice to liquefy a substance at its @C01402@. Above the critical pressure, increasing the temperature will not cause a fluid to vaporize to give a two-phase system.
Source:
PAC, 1993, 65, 2397. (Nomenclature for supercritical fluid chromatography and extraction (IUPAC Recommendations 1993)) on page 2399 [Terms] [Paper]