A Real Gas Behaves like an Ideal Gas at (1) High Temperature and Low pressure (2) Low temperature and High pressure (3) High temperature and High pressure (4) Low temperature and Low pressure

By BYJU'S Exam Prep

Updated on: November 9th, 2023

At higher temperatures and lower pressure, a real gas behaves like 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. A theoretical gas known as an ideal gas is made up of numerous randomly moving point particles with no interparticle interactions.

Behavior of Real Gas like an Ideal Gas

Real gases are non-ideal gases because real gases’ molecules occupy space and interact, contravening the ideal gas law. The following factors must be considered in order to comprehend how real gases behave: variable specific heat capacity, van der Waals forces, non-equilibrium thermodynamic effects, problems with molecular dissociation, and elementary reactions with variable composition are just a few of the effects of compressibility.

  • 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.

Characteristics of Ideal Gas

  • They are tiny, point-sized molecules with negligible volume.
  • The gas-particle interactions are not influenced by an attractive or repelling force.
  • The collision between the gases and the container’s walls needs to be completely elastic (there is no loss of energy).
  • It adheres to the gas law, i.e. P V = n R T (where P is the gas pressure, V is volume, n is moles, R is the universal gas constant of 8.314 J/mol-K, and T is temperature).


A Real Gas Behaves Like an Ideal Gas at

A real gas behaves like an ideal gas at higher temperatures and lower pressure. It happens because the potential energy starts to pale in comparison to the kinetic energy. Additionally, the distance between molecules becomes more important than the size of the molecules themselves. Some gases like oxygen, nitrogen, carbon dioxide, hydrogen, noble gases, and mixtures such as air can be considered ideal gases within reasonable tolerances.

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