| Fluid Statics | |||||||||
Manometers: Pressure Measuring Devices |
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| Manometers are simple devices that employ liquid columns for measuring pressure difference between two points. In Figure(L 8.1), some of the commonly used manometers are shown. In all the cases, a tube is attached to a point where the pressure difference is to be measured and its other end left open to the atmosphere. If the pressure at the point P is higher than the local atmospheric pressure the liquid will rise in the tube. Since the column of the liquid in the tube is at rest, the liquid pressure P must be balanced by the hydrostatic pressure due to the column of liquid and the superimposed atmospheric pressure, Patm . |
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Fig : L - 8.1 Simple Manometer |
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| This simplest form of manometer is called a Piezometer . It may be inadequate if the pressure difference is either very small or large. | |||||||||
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L - 8.1