Hydrostatic
pressure at any height below the water surface is
calculated by P=hdg where h is the height below the open water surface, d is the density of water and g is the acceleration due to gravity. So if you want to
calculate gauge pressure at height h then use
formula P=hdg+P\u2218 where P\u2218 is atmospheric
pressure.
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Gage pressure is the most often used method of measuring pneumatic pressure. It is the relative pressure of the compressed air within a system. Gage pressure can be either positive or negative, depending upon whether its level is above or below the atmospheric pressure reference.
