Chapter 1, Problem 1.17P

(a)

Interpretation Introduction

Interpretation:

The quantity of $39\text{ ppb}$ has to be converted to pressure in mPa and compared with pressure of $19\text{ mPa}\text{.}$

Concept introduction:

Parts Per Billion refers to a term that expresses concentration of certain substance in a mixture of substances.   It is denoted as ppb.  It is represented as,

$ppb\text{ = }\frac{mass\text{ of substance}}{mass\text{ of sample}}\times {10}^9$

(b)

Interpretation Introduction

Interpretation:

The pressure of $19\text{ mPa}$ has to be converted to ppb under atmospheric pressure $9.6kPa.$

Concept introduction:

Parts Per Billion refers to a term that expresses concentration of certain substance in a mixture of substances.   It is denoted as ppb.  It is represented as,

$ppb\text{ = }\frac{mass\text{ of substance}}{mass\text{ of sample}}\times {10}^9$