What device can be used to measure the flow of liquid or gas?

The Venturi tube is an effective device for measuring the flow of liquid or gas due to its design, which utilizes the principle of fluid dynamics. As fluid passes through a Venturi tube, the cross-sectional area reduces, resulting in an increase in velocity and a corresponding decrease in pressure according to Bernoulli’s principle. By measuring the pressure difference between the wider section of the tube and the narrower section, one can calculate the flow rate of the fluid moving through the tube based on the relationship between pressure and flow velocity.

This method is particularly advantageous because it is simple, does not have any moving parts, and can be used across a wide range of flow rates and fluid types. The key benefit is that it provides an accurate measure of flow without significantly obstructing the flow path, which can result in minimal energy loss or turbulence.

In contrast, the other devices mentioned have different primary functions. A strain gauge is typically used to measure force or pressure by the strain experienced by a material, while a flow nozzle is also a measurement device but tends to have a more specific application in high-velocity flows and may not be as versatile as the Venturi tube. A control valve is primarily designed to control the flow rate or pressure within a system rather than to