At pressure, that is higher than the critical pressure of water, water is in special state, that is known as supercritical fluid state. Critical pressure is Pcr = 22.09 MPa. Thermal Engineering
Critical Pressure of Water
At pressure, that is higher than the critical pressure, water is in special state, that is known as supercritical fluid state. A supercritical fluid is a fluid that is at pressures higher than its thermodynamic critical values. At the critical and supercritical pressures a fluid is considered as a single-phase substance in spite of the fact that all thermophysical properties undergo significant changes within the critical and pseudocritical regions.
For water, the critical parameters are the following:
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