Noun
supercritical fluid (plural supercritical fluids)
(physics) A substance at a temperature and pressure above its own thermodynamic critical point that can diffuse through solids like a gas and dissolve materials like a liquid.
The most commonly used supercritical fluids are carbon dioxide and water.
Supercritical fluid chromatography details Supercritical fluid chromatography is a separation technique in which the mobile phase is a fluid above and relatively close to its critical temperature and pressure. Source: Internet