Question

The relation between saturation pressure of water and temperature in psia units

Answer 1

water tends to evaporate or vaporize by projecting molecules into the space above its surface. If the space is confined the partial pressure exerted by the molecules increases until the rate at which molecules reenter the liquid is equal to the rate at which they leave. The vapour pressure of water is the pressure at which water vapour is in thermodynamic equilibrium with its condensed state. At higher pressures water would condense. At this equilibrium condition the vapor pressure is the saturation pressure.