In the static fluid subjected to gravity pressures increase linearly with depth at rate equal to specific weights of fluid. Consider a fluid enclosed in a container. At depth h, let pressure at P1 which is same along the horizontal line as there is no force along horizontal and P2 be pressure at depth h + dh. If r be the density of fluid at depth h, then pressure of column of height dh 2 is rdgh.
Thus, pressure increases linearly with depth at rate
If an open container in atmosphere contains a liquid of density r, then pressure at depth h.
where P0 is the pressure at the upper surface if liquid due to air column.
The standard value of P0 or atmospheric pressure is 1.01× 105 Pa. To find the pressure at a point the depth is measured from the free end of the liquid surface.
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