Before revision: Pascal's law or principle states that for an incompressible fluid at rest, the difference in pressure is proportional to the difference in height , and this difference remains the same whether or not the overall pressure of the fluid is changed by applying an external force.
After revision: Pascal's law or principle states that for an incompressible fluid at rest, the difference in pressure is proportional to the difference in area/volume , and this difference remains the same whether or not the overall pressure of the fluid is changed by applying an external force.