____ is only present when there is a restriction against the flow of the fluid.
A) Flow
B) Pressure
C) Movement
D) Control

Question

Quizplus · Accepted Answer

Pressure is the force applied perpendicular to the surface of an object per unit area. It is only present when there is a restriction against the flow of the fluid, such as a closed valve or a narrow pipe. Flow, movement, and control can be present with or without a restriction.

____ Is Only Present When There Is a Restriction Against