Chapter 3, Problem 3.54P

Interpretation Introduction

(a)

Interpretation:

The pressure exerted by student with her lungs on the water in the tube is to be calculated, and all assumptions are to be stated.

Concept introduction:

The pressure exerted by student with her lungs on the water in the tube is calculated by the formula,

$P=P_{\text{a}}+\text{ρ}gh$

Where,

• $\text{ρ}$ is the density of sea water.
• $g$ is the acceleration due to gravity.

$h$ is the difference in the water level $\left(h\right)$, generated by student

Interpretation Introduction

(b)

Interpretation:

The difference in the liquid level, if ethanol is used instead of water is to be calculated.

Concept introduction:

The difference in the liquid level is calculated by the formula,

$h=\frac{P-P_{\text{a}}}{\text{ρ}g}$

Where,

• $\text{ρ}$ is the density of sea water.
• $g$ is the acceleration due to gravity.
• $P$ is the pressure exerted by student.
• $P_{\text{a}}$ is the atmospheric pressure.