上浒充通大￥ Shanghai Jiao Tong University 4.5 Hydrostatic Pressure Difference Between Two Points There are several "rules"or comments which directly result from the above equation: Air 1)If you can draw a continuous line Water through the same fluid from point 1 to point 2,then p=p2 if=. For example,consider the oddly shaped container.By this rule,P=p2 and p4=Ps since these points are at the same elevation in the same fluid.However,P2 does not equal P3 even though they are at the same elevation,because one cannot draw a line connecting these points through the same fluid.In fact,p2 is less than p3 since mercury is denser than water.Shanghai Jiao Tong University 4.5 Hydrostatic Pressure Difference Between Two Points There are several "rules" or comments which directly result from the above equation: 1) If you can draw a continuous line through the same fluid from point 1 to point 2, then p1 = p2 if z1 = z2. For example, consider the oddly shaped container. By this rule, p1 = p2 and p4 = p5 since these points are at the same elevation in the same fluid. However, p2 does not equal p3 even though they are at the same elevation, because one cannot draw a line connecting these points through the same fluid. In fact, p2 is less than p3 since mercury is denser than water