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# Manometer

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### Manometer

1. 1. Manometer M.Sc-I (Electronics) DOES – PC (UOP)
2. 2. U Tube Manometer: Manometers are devices in which one or more columnsof a liquid are used to determine the pressure differencebetween two points.
3. 3. • A manometer is comprisedU- Tube Manometer: of a bulb containing a gas and a U-shaped tube. • The U-shaped tube is partially filled with mercury. The weight of the mercury puts pressure on the gas. • If the U-tube is OPEN PHg there is also air pressure acting on the gas. • The gas molecules put pressure on the mercury.
4. 4. Closed Manometers: • There is a balance between the weight of the mercury vacuum on the left (PHg) and the pressure of the gas on the PHg right (Pgas). • The difference between the heights of the mercury on each side of the tube is a measure of the pressure of the gas. Pgas = Dh
5. 5. Open Manometers: • When gas pressure is greater than atmospheric pressure, the mercury is pushed toward the Pair open end. • The balance is between the gas on the right, and the air plus mercuryPHg on the left. Pair + PHg = Pgas • The weight of the mercury is measured as the height difference: PHg = Dh So Pgas = Pair + Dh
6. 6. Open Manometers: • When gas pressure is less than atmospheric pressure, the mercury is pushed toward the gas reservoir. • The balance is between the air PHg on the left and the gas plusPair mercury on the right: Pair = Pgas + PHg • The weight of the mercury is measured as the height difference: PHg = h So Pair = Pgas + h Or Pgas = Pair- h
7. 7. “Leadership & Learning are indispensable to each other.”