The ideal gas law is obeyed by gases under the assumption that the size of their particles is negligible compared to the distance between them.

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The ideal gas law, PV = nRT, assumes that gas particles have no volume and do not interact with each other except through elastic collisions. This is only true for gases where the size of their particles is negligible compared to the distance between them. Therefore, the ideal gas law is only applicable to ideal gases which are the ones that follow this assumption.

The Ideal Gas Law Is Obeyed by Gases Under the Assumption