Pressure P is defined to be force divided by the area over which that force is applied: Then the pressure at the location of A is the force due to the fluid on one side of A on the fluid o...Pressure P is defined to be force divided by the area over which that force is applied: Then the pressure at the location of A is the force due to the fluid on one side of A on the fluid on the other side of A, divided by the area A. The pressure P is sometimes called the absolute pressure; this is to distinguish it from the gauge pressure Pg, which is the difference between absolute pressure and atmospheric pressure Pa:Pg=P−Pa.
