Chemistry / Chem 1438 · Atom · ~20 seconds
The Critical Point and the Supercritical Fluid
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A phase diagram's critical point is the temperature and pressure above which the liquid-gas boundary vanishes, forming a supercritical fluid.
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Supercritical carbon dioxide removes caffeine from coffee beans as a solvent, leaving no chemical residue behind.
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Above the critical temperature, no added pressure condenses a gas back into a distinct liquid — the two phases have merged.