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Pascal's law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere. The law was established by French mathematician Blaise Pascal in 1647â48.
Static Pressure and Pressure Head in Fluids. Static pressure and pressure head. Pressure indicates the normal force per unit area at a given point acting on a given plane. Since there is no shearing stresses present in a fluid at rest - the pressure in a fluid is independent of direction. For fluids - liquids or gases - at rest the pressure gradient in the vertical direction depends only on the specific weight of the fluid.