Webelos Scientist Activity Badge
Req. 2.

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Pascal's law or the principle of transmission of fluid-pressure is a principle in fluid mechanics that states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations (initial differences) remain the same.

A great example of this is the next time you brush your teeth.  As you squeeze the toothpaste tube you are acting on Pascal's Law. What happens to the toothpaste as you apply pressure to the tube? Why does the toothpaste not stay within the tube as you apply pressure?