### Question

What is the Pascal's law?

When you squeeze one end of a tube of toothpaste out the other end, you are watching Pascalï¿½s 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.

Pascalï¿½s 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.

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### Science Quote

'I have deep faith that the principle of the universe will be beautiful and simple.'

Albert Einstein
(1879-1955)