The liquid of density p in a horizontal pipe with a cross-section being a square with the side a before a constriction is at pressure P1 and following with the speed v1. What is the speed and pressure in the constriction having a cross-section of a square with side b?  Please be specific and provide step by step. Use the notations provided by the problems no moles and provide analytical (symbolic) solution

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.