Chapter 12, Problem 1RQ

Interpretation Introduction

Interpretation:

Pressure of gas has to be explained.

Concept Introduction:

Gas is used to define one state of matter that has very large space between its molecules as compared with liquid and solid.

Explanation of Solution

Pressure represents force produced by substances per unit area on other substances. Therefore pressure of gas represents force produced by gas on walls of container. Barometer is used for measurement of pressure of gas in atmospheric units $\left(\text{atm}\right)$. Pressure can also be represented in many units such as $\text{torr}$, $\text{mm Hg}$, and pascal $\left(\text{Pa}\right)$. These units can be related to one another as follows:

  $\begin{array}{c}1\text{ atm}=760\text{ torr}\\ =760\text{ mm Hg}\\ =\text{101325 Pa}\\ \text{=101}\text{.325 kPa}\end{array}$