There are many devices and situations in which fluid flows at a constant height and so can be analyzed using Bernoulli's principle. These devices include, but are not limited to, entrainment devices and fluid flow measuring devices.
Entrainment devices use a high fluid speed to create low pressures and, thus, entrain one fluid into another. Some examples of these devices are given below:
Some devices use Bernoulli's principle for the measurement of fluid speed. Examples of these devices include, Prandtl tubes, also known as pitot tubes, Venturi tubes, and a manometer connected to two tubes that are close together and small enough not to disturb the flow.
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