• Pascal's law states that when there's a change in pressure at one point in a container containing incompressible fluid,there's change in pressure in every other point in the container. Now the derivation of P=pgh is dependent on Newton's second law of motion defining force F=MA Pressure =MA where M is mass and A= acceleration. In case of fluid pressure in a column,A=g so F=Mg Now Mass =p x volume now volume = area of the container base x it's height =Axh so F=pxAxhxg Now Pressure P=Force/Area of the base do P=pxAxhxg/A=pgh There you get your formula derived P=pgh. Ask in case of any doubts.

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