Why does pressure in liquid displaces liquid in u tube manometer , quora?
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Pressure measuring devices using liquid columns in vertical or inclined tubes are called manometers. One of the most common is the water-filled u-tube manometer used to measure pressure difference in pitot or orifices located in the airflow in air handling or ventilation system.
In the figure, below illustrates the water levels in an u-tube where the left tube is connected to a point with higher pressure than the right tube - example: the left tube may be connected to a pressurized air duct when the right tube is open to the ambient air.
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