Chapter 16, Problem 16A.6P

Interpretation Introduction

Interpretation:

An expression that shows the variation in the pressure of a gas inside an effusion with time is to be stated.  The time which is required for the pressure to decrease to half its initial value is independent of the initial pressure is to be shown.

Concept introduction:

Effusion is a method in which gas flows from a container through a hole of significantly lower diameter as compared to the molecule's mean free path.  The rate of effusion is expressed by the formula shown below.

    $Z_{\text{W}}{A}_{\text{ο}}=\frac{p{A}_{\text{ο}}}{{\left(2\pi mkT\right)}^{1/2}}$