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well not exactly
although I agree that natural gas and air aren't "solid" gases they still do match the definition of gas
people just normally don't refer to them as such because they are composed of other gases who exist on their own in an irregular ratio
however, since both of them possess some fundamentally important qualities they are still sometimes called gases
the same can be applied to any other mixture of gases but since they don't have any essential qualities that is rarely done, but since a result of mixing two matters of the same aggregate state will result in a new matter of the same state, so from a purely technical point of view they are indeed gases but they are never being referred to as such in practice
so I realised argument was pointless and replid with a single "ok" in order not to elaborate