Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
Correct answer: B. 12.6 H
- A. H
- B. 12.6 H
- C. 13.6 H
- D. 14.6 H
Explanation
For a mercury-water differential manometer, the pressure head in water is (13.6 − 1)H = 12.6H mm of water. The factor 13.6H would apply if the water-column contribution were incorrectly neglected.
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