Question

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?

Answer 1

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.