Answer:
When the liquid passes through a narrow constriction, its velocity increases \[(\upsilon \propto 1/a)\] in accordance with the equation of continuity. The Bernouilli's equation for the horizontal flow is \[{{P}_{1}}+\frac{1}{2}\rho \upsilon _{1}^{2}={{P}_{2}}+\frac{1}{2}\rho \upsilon _{2}^{2}\] As the velocity is high at the narrow constriction, so the pressure is low.
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