Chapter 11, Problem 11.161QP

Interpretation Introduction

Interpretation: The negative deviation from ideal behavior at lower pressures and the positive deviation from ideal behavior at higher pressure have to be explained.

Concept Introduction:

Ideal gas is the most usually used form of the ideal gas equation, which describes the relationship among the four variables P, V, n, and T.  An ideal gas is a hypothetical sample of gas whose pressure-volume-temperature behavior is predicted accurately by the ideal gas equation.

$\text{PV = nRT}$

The compressibility factor Z of a gas is defined as $\text{Z=Preal}\frac{\text{V}}{\text{nRT}}$. Note that for an ideal gas, Z = 1 at all temperatures and pressures.