vapour_pressure: Vapour pressure of water
In ratral/wcontrolvalve: Meta Analysis Plunger Valves

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The vapor pressure of water is the pressure at which water vapor is in thermodynamic equilibrium with its condensed state. At higher pressures water would condense. The water vapor pressure is the partial pressure of water vapor in any gas mixture in equilibrium with solid or liquid water. As for other substances, water vapor pressure is a function of temperature and can be determined with the Clausius–Clapeyron relation. Approximation formula : The Buck equation. where T is in °C and P is in kPa. https://en.wikipedia.org/wiki/Vapour_pressure_of_water