Fluid Flow, Continuity, and Bernoulli’s Equation (4B) Practice Test

A researcher measures steady, incompressible flow through a horizontal tube and reports $A_1 v_1 = A_2 v_2$ for two points along the tube. Which experimental observation would most directly violate the use of the continuity equation in this form for the segment between points 1 and 2?

A horizontal pipe carries an incompressible fluid at steady flow. At point 1, the speed is $v_1$ and static pressure is $P_1$. At point 2 downstream, the cross-sectional area is smaller and the speed is measured to be $v_2 > v_1$. Neglecting viscosity, which statement is best explained by Bernoulli’s equation?