## 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:

**P**_{cr}= 22.09 MPa**T**_{cr}= 374.14 °C (or 647.3 K)**v**_{cr}= 0.003155 m3/kg**u**_{f}= u_{g}= 2014 kJ/kg**h**_{f}= h_{g }= 2084 kJ/kg**s**_{f}= s_{g}=4.406 kJ/kg K

See also: Critical Point of Water

See also: Supercritical Fluid