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Generally speaking, air, which is a mixture of a number of gases, is homogeneous.

It's true that some conditions will allow some heterogeneous behavior, where "separation" occurs. The collection of radon gas in low areas (like the basement of a house) where there is no air circulation is an example. And things smell differently here and there as you wander about because of other things in the air. But just walking around and "looking" at the air as you go, you'll find the gases in it are evenly distributed. There generally won't be more carbon dioxide here and less nitrogen there and more or less oxygen in either place. The air will pretty much be the same everywhere you travel around. Gases diffuse in a volume of space to "fill" it and will end up fairly evenly distributed under "normal" conditions.

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13y ago
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Q: Is air a heterogeneous or homogeneous mixture?
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