We can find the relationship between the general pressure at any point in a fluid statics, and height y points, we will assume that the density. And acceleration due to earth's gravity g is constant throughout the fluid.(equilibrium) every small part of fluid that is in equilibrium with, consider a small portion of the ของไหลที่ thick dy as shown in Figure 9-2 both above and below the surface area. A bottom surface at y.Y dy above the reference level y = 0 (reference level at the bottom of the container)
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