Since the gas particles are must closer to each other then the real gases deviate from ideal behavior at high pressures
What is the ideal behavior of the gases?
There are four guiding principles that determine if a gas is "ideal": The volume of the gas particles is quite small. The gas particles are of similar size and do not interact with one another through intermolecular forces (attraction or repulsion). The random motion of the gas particles is consistent with Newton's Laws of Motion.
Thus according to the ideal behavior of the gases the gas particles are must closer to each other .
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