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SuperCritical Fluid Action

The supercritical fluid commonly utilized is carbon dioxide (CO2). The state diagram of CO2 visualizes the various phases (solid, liquid, gas) depending on pressure and temperature. CO2, at 31,1°C and 73,8 bar, is in its supercritical state, in which there is no distinction between liquid and gaseous phases. Transiction frames from gas to supercrtical fluid.

 Increasing the temperature and keeping the pressure constant (73,8 bar), CO2 remains in the supercritical state, and so happens when pressure is increased and temperature is constant (31,1°C): this individuates two rays – respectively parallel to to the pressure and temperature axes – defining the zone in which CO2 is in the supercritical state; in particular, within this state, the possible combinations of pressure and temperature are shownto variate CO2 solubilizing properties.


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