Consider the graph between compressibility factor Z and pressure P The correct increasing order of ease of liquefaction of the gases shown in the above graph is

Z1 means force of attraction dominating ie a is considerable b can be negligible at low temperature and low pressure Lower is the value of Z easier is the process of liquification
The compressibility factor is actually a factor that corrects the actual value of the gas versus the ideal gas. Let us learn and understand this concept.
Watch this video to understand the behaviour of real gases with the help of the compressibility factor. This is an important topic for JEE main.
What is the compressibility factor, and how does it vary with an increase in temperature and pressure? Watch this video to get the answer. This is an importa

Thermodynamics: An Engineering Approach - 5th Edition - Part II by

3.2 Real gas and compressibility factor – Introduction to Engineering Thermodynamics

The given graph represent the variations of compressibility factor

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physical chemistry - Is the compressibility factor smaller or

Heat and Cold

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Compressibility factor - Wikipedia

Compressibility factor (Z=(PV)/(nRT)) is plotted against pressure

Thermodynamics: An Engineering Approach - 5th Edition - Part II by

PDF) Elxth Edition in SI Units