Is the Pressure P2 caused by a reaction force to the fluid-fluid collision, or is it the result of the collisions of the water molecules with the walls at the neck of this experiment. The part which confuses me is that P2 needs to be less than P1but P2 is exerted over a longer distance and the pressure exerted by fluids is calculated by hdg. Is there a reason why P2 is less than P1?
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