The speed of a liquid flowing through a pipe increases and its pressure decreases when liquid passes through a narrow constriction in the pipe. Why?

Explanation

When a liquid while flowing through a pipe passes through a narrow constriction in the pipe, the velocity of liquid increases because `(upsilon prop 1//area)` ac cording to equation of continuity. Ac cording to Bernoulli's equation for a horizontal flow of liquid through a pipe.
`P+1/2 rho upsilon^(2) = "a constant"`
It means where `upsilon` is large, P is small and viceversa. Since velocity is high at the narrow constriction, hence the pressure is low there.