Supercritical-fluid meaning

so͝o'pər-krĭt'ĭ-kəl
A substance at a temperature above its critical point, having properties intermediate between those of a liquid and those of a gas.
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(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.

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