We know that pressure is inversily proportional to area but when fluid is flowing through the venturimeter the diameter of venturimeter is reduces so it is expected that the pressure is increases but it not in real why?give ans immediately.

We know that pressure is inversily proportional to area

This is only true if there is a constant total force. In general this does not apply to fluids.


but when fluid is flowing through the venturimeter the diameter of venturimeter is reduces so it is expected that the pressure is increases but it not in real why?

Are you familiar with the Bernoulli Equation? Conservation of energy in fluid flow results in:

\frac {v^2} 2 + gz + \frac P {\rho} = Constant

So as v increases if z is constant (i.e. Horizontal flow) then P must be reduced.


give ans immediately. You're welcome.