What is the Pascal's law?

Asked by: Anshuman Mathur


When you squeeze one end of a tube of toothpaste out the other end, you are watching Pascal�s principle in action. The principle was first stated clearly in 1652 by Blaise Pascal (for who the unit of pressure is named):

A change in the pressure applied to an enclosed incompressible fluid is transmitted undiminished to every portion of the fluid to the walls of its container.

Pascal�s principle put more simply, basically means that an incompressible fluid transmits pressure. This is the basis to hydraulic lever. In a hydraulic lever, for example, you apply a force to the left-hand piston over a given area, this force is then transformed in to a pressure which is transmitted through the hydraulic fluid or oil. This pressure then transforms back in to an output force over another given area for the right-hand piston.
Answered by: Dan Summons, Physics Undergrad Student, UOS, Souhampton