Chapter 3, Problem 3.53P

Interpretation Introduction

Interpretation:

The absolute pressure in the duct, the gauge pressure in the duct, and the atmospheric pressure in $\text{mm}\text{Hg}$ are to be calculated.

Concept introduction:

The expression to calculate the pressure of an incompressible fluid is,

$P-P_{\text{a}}=\text{ρ}gh=P_{\text{g}}$

The difference between absolute pressure ($P$) and atmospheric pressure ($P_{\text{a}}$) is equal to the product of density, acceleration due to gravity and depth which is further equal to the gauge pressure $\left(P_{\text{g}}\right)$