Suppose there is a ventury tube through which a liquid of density ρ is flowing. The area of Cross Section is A1 at the wider part and A2 at the constriction.Suppose P1 and P2 be the pressure at A1 and A2 respectively. As there are two vertical tubes one near A1 and other near A2. Then why is the pressure difference between the two vertical tube = P1-P2 = Pressure difference between A1 and A2?
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