The angle of the divergent portion of a venturimeter is less than the angle of the converging portion

✅ Explanation:
Venturimeter
A venturimeter is a device used for measuring the rate of flow of a fluid of a liquid flowing through a pipe
The venturimeter always have smaller convergent portion and a larger divergent portion.
This is done to ensures a rapid converging passage and a gradual diverging passage in the direction of flow to avoid the loss of energy due to separation.
In the course of flow through the converging part, the velocity increases in the direction of flow according to the principle of continuity, while the pressure decreases according to Bernoulli’s theorem.
The velocity reaches its maximum value and pressure reaches its minimum value at the throat.
Subsequently, a decrease in the velocity and an increase in the pressure take place in course of flow through the divergent part.
The angle of convergence ≈ 20°
The angle of divergence = 6° – 7° → It should not be greater than 7° to avoid flow separation