Fluids like solid deform or change shape when subjected to tangential force but unlike solid, they does not oppose tangential deforming force i.e there is no shear stress in fluids and hence they do not have fixed shape rather have tendency to flow under forming deforce. This property make fluids to exert normal force at each point of boundary.
If DF force is exerted by fluid on area DA, then intensity of force exerted by fluid at that point is defined as pressure and is given as It is a scalar quantity with SI unit Pascal (Pa).
The intra-molecular force of attraction between the molecules of a liquid is called cohesive force while the inter-molecular force of attraction between the surface molecules of liquid and other liquid or solid material is called adhesive force
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