When a tube does not change radius, the pressure of a fluid must remain constant throughout the tube.

Question

Quizplus · Accepted Answer

According to Bernoulli's principle, in a flowing fluid, the total energy along a streamline (potential energy, kinetic energy, and pressure energy) remains constant. If the fluid's velocity changes while flowing through a tube of constant radius, the pressure can change to conserve the total energy.

When a Tube Does Not Change Radius, the Pressure of a Fluid