Is air a pure substance?

Air is not a pure substance, as it’s a mixture of various elements in just the right proportion to sustain human life on Earth. A pure substance is one which has same chemical composition in all its phases. ir is a mixture, mostly of nitrogen (78%) and oxygen (20%). But in case of air since we have different kinds of gases and that to in no fixed ratio hence we call it as a mixture and not as a pure substance.

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