
Concept explainers
The reading of mercury manometer.

Answer to Problem 3.185P
The reading of mercury manometer is
Explanation of Solution
Given information:
The temperature of Kerosine is
Write the expression for the Bernoulli’s equation between the section (1) and section (2) of the given system.
Here, the pressure at inlet is
Write the expression for the flow rate at section (1).
Here, the area at section (1) is
Write the expression for the area at section (1).
Here, the diameter at section (1) is
Substitute
Write the expression for the flow rate at section (2).
Here, the flow rate is
Write the expression for the area at section (2).
Here, the diameter at section (2) is
Substitute
Write the expression for the pump power.
Here, the specific density of kerosene is
Write the expression for the weight density of kerosene.
Here, the density of kerosene is
Write the expression for the weight density of mercury.
Here, the density of kerosene is
Substitute
Write the expression for the pressure difference.
Substitute
Calculation:
Refer to the property table for liquids to obtain the weight density of kerosene as,
Refer to the property table for liquids to obtain the weight density of mercury as,
Substitute
Substitute
Substitute
Substitute
Substitute
Conclusion:
The reading of mercury manometer is
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