How to Separate Different Gases from Air?


We know that Air is a mixture of different gases like Nitrogen, Oxygen, Carbon Dioxide etc.

They are separated by using Fractional Distillation





Air is compressed and cooled to Liquid

This is done by increasing pressure and decreasing temperature

Liquid Carbon Dioxide flows out as dry ice



Remaining Liquid Air is Warmed up

Heat is applied slowly by using fractional distillation column

Different Gases get separated at different Heights

This is because of Difference in boiling points of different gases

                                Oxygen Argon   Nitrogen

Boiling Point (in celsius) -183   -186       -189


Nitrogen and Argon Move to the top

Oxygen remains at the bottom, it is cooled as liquid Oxygen



  1. Class 9
  2. Chapter 2 Class 9 - Is Matter Around Us Pure

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo