When does a Real Gas behave as an Ideal Gas?

By Mandeep Kumar|Updated : July 20th, 2022

At higher temperatures and lower pressure, a real gas behaves as an ideal gas. It is because the potential energy becomes less significant as compared to the kinetic energy. Also, the size of the molecules becomes less significant compared to the empty space between them.

Answer: A real gas behaves as an ideal gas at higher temperatures and lower pressure.

Some gases like oxygen, nitrogen, carbon dioxide, hydrogen, noble gases, and mixtures such as air can be considered ideal gases within reasonable tolerances. The ideal gases are the classical or Maxwell–Boltzmann ideal gas, the ideal quantum Fermi gas, and the ideal quantum Bose gas. The ideal gas model can fail at higher pressures or lower temperatures. The failure is possible for many refrigerants and for gases with strong intermolecular forces.

Summary:

When does a Real Gas behave as an Ideal Gas?

At lower pressure and higher temperature, a real gas behaves as an ideal gas. An ideal gas comprises many randomly moving particles and it obeys the ideal gas law.

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