Chapter 19, Problem 19.34E

Interpretation Introduction

Interpretation:

The pressure of hydrogen in interstellar space is to be expressed in units of millitorr.

Concept introduction:

Pressure is defined as the force applied on a unit area. The SI unit of pressure is Pascal. The other units of pressure are $\text{atm}$, $\text{torr}$ and $\text{mmHg}$. These units can be interconverted into one another by multiplying or dividing by a specific number. The pressure of a gas is calculated by the formula,

$p=\frac{2N{E}_{\text{avg}}}{3V}$

Where,

• $N$ is the number of atoms.

• $V$ is the volume.

• $E_{\text{avg}}$ is the average energy of the atoms.