What is a common characteristic of the Venturi Tube?

The Venturi Tube is primarily designed to measure flow. This is achieved through a principle known as the Venturi effect, which states that fluid velocity increases as it passes through a narrowed section of the tube, while the pressure decreases. By observing the change in pressure before and after the constriction, one can derive the flow rate of the fluid moving through the tube. This makes it a valuable tool in various applications within process industries where precise flow measurement is necessary.

The other options pertain to different measurement types that the Venturi Tube does not address. Temperature measurements typically require thermometers or temperature sensors, while liquid pressure would be measured using pressure sensors or gauges. Humidity, on the other hand, is measured with hygrometers. Hence, the primary function of the Venturi Tube is to provide a reliable measurement of flow.