Reading of mercury level in the closed end arm of a manometer is 100 mm and in the arm attached to the system it is 70 mm. What is the pressure of the system?
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Answer : The pressure of the system is 30 mm of Hg.
Explanation : Given,
Pressure in the arm attached to the system = 70 mm of Hg
Pressure in the closed end arm of a manometer = 100 mm of Hg
As per question,
System pressure = Gauge pressure = Difference in mercury level
Difference in mercury level = 100 mm - 70 mm
Difference in mercury level = 30 mm of Hg
Therefore, the pressure of the system is 30 mm of Hg.
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