Fluid Statics
Example 7:

A manometer connected to a pipe indicates a negative gauge pressure of 70 mm of mercury . What is the pressure  in the pipe in N/m2 ?

Solution :

Given data:

               Manometer pressure- 70 mm of mercury (Negative gauge pressure)

               A pressure of 70 mm of Mercury, P = r gh = 9.322 kN/m 2

               Also we know the gauge pressure is the pressure above the atmosphere.

              Thus a negative gauge pressure of 70 mm of mercury indicates the absolute pressure of

               P abs = 101.213 + (-9.322) = 91.819 kN/m 2

              Answer: 91.819 kN/m 2

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