Pressure due to elevation of water. Equals 0.433 pounds per square inch (PSI) per foot of elevation. Back pressure. (Approximately 0.5 PSI is required to lift water 1 foot in elevation)
the pressure above gravity at the head of the column. Expressed in psig, bar, atm, or MPa.
Expression of a pressure in terms of the height of fluid. P = ypg, where p is fluid density and y is the fluid column height.