critical temperature, \(T_{\text{c}}\)

https://doi.org/10.1351/goldbook.C01402

That temperature, characteristic of each gas, above which it is not possible to liquefy a given gas.

Sources:
PAC, 1990, 62, 2167. 'Glossary of atmospheric chemistry terms (Recommendations 1990)' on page 2183 (https://doi.org/10.1351/pac199062112167)
PAC, 1993, 65, 2397. 'Nomenclature for supercritical fluid chromatography and extraction (IUPAC Recommendations 1993)' on page 2399 (https://doi.org/10.1351/pac199365112397)