How did the scientists like Boyle and Avagadro did experiments and still got results, which supported the ideal gas theory? It is actually wrong and still how did they get results that volume is inversely proportional to pressure while temperature directly to pressure. I think the only chance of disproving ideal theory is experimenting. There is no theoretical reason for such a behavior of real gases. Scientists who are considered to be great developed the ideal theory. So I doubt their Excellency if they made mistakes in observations. This is because I learn them to be great scientists. Moreover why is importance given to ideal theory when it is already disproved?