Q.
259.
Explain working of manometer ??
Answers
Answer:
A manometer works on the principle of hydrostatic equilibrium and is used for measuring the pressure (static pressure) exerted by a still liquid or gas. ... In its simplest form, a manometer is a U-shaped tube consisting of an incompressible fluid like water or mercury. It is inexpensive and does not need calibration.
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WORKING OF MANOMETER
The purpose of a manometer is to measure the pressure of a contained gas.
✪ It consists of a U-shaped glass tube with one end open to the atmosphere, mercury in the bottom of the U and the gas to be measured in the other side of the U-tube.
✪ The gas is added then the glass tube is sealed on the gas side so the gas is trapped on one side of the mercury.
(See open-end manometer in attachment)
✪ The liquid mercury is equalized in the two sides of the tube at atmospheric pressure. When the gas is added, it will exert pressure on the mercury on the other side.
✪ If the pressure of the gas is equal to atmospheric pressure the mercury will remain at the same levels on both sides. If the gas is exerting more pressure on the mercury than the atmosphere exerts, it will cause the mercury to be higher on the atmosphere side than on the sealed side.
✪ The difference between the two heights tells you how much higher the gas pressure is than atmospheric pressure.
✪ Adding the difference to the atmospheric pressure (this is usually measured in millimeters of mercury) will give the gas pressure.
✪ If the gas is at a pressure below that of the atmosphere then the mercury will be lower on the gas side and the difference in height is subtracted from atmospheric pressure to get the gas pressure.
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