Why don't ideal gases exist?

The idea of ideal gas is purely hypothetical and such gases does not exist in the physical universe. However, the concepts of ideal gas is a tool to calculate satisfactory approximate solutions. The explanation for why it does not exist in the real world is in the definition itself. read more

Of course, an ideal gas does not exist except as a conceptual notion, an ideal. Physicists and chemists idealized the behaviour of real gases so that they could explain these phenomena. Under conditions of low pressure and high temperature, all gases behave like real gases, even gases such as UF_6. Idealization is therefore useful. read more