Let us consider a fluid is at rest and this fluid puts pressure at a point O of small area dA. If the force acted on O is dF, then pressure can be given by-

Pressure, P = dF/ dA

Or,

P = F/ A (Suppose force is acted uniformly on the area A)

Unit of Pressure:

P = N/ m2

   = Pascal (Pa)

1 bar = 105 Pa or 105 N/m2

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