PRESSURE VARIATION IN A FLUID AT REST

Pressure Variation In A Fluid At Rest. 

                      The pressure at any point in a fluid at rest is obtained by the Hydrostatic Law which states that the rate of increase of pressure in a vertically downward direction must be equal to the specific weight of the fluid at that point. This is proved as : 

    Consider a small fluid element as shown in figure :

Forces on a fluid element.

Let    ∆A = Cross -sectional area of element

          ∆Z = Height of fluid element

            p = Pressure on face AB

            Z = Distance of fluid element from free surface. 

Derivation of Hydrostatic Law. 

                                    The End. 

    Please comment if you have any query. 

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