I've learned that in a gas, the solute has to be a gas a well. Is that always the case? How about water in air, is that liquid in a gas, or a gas in a gas?


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  • $\begingroup$ Being a gas or a liquid is a property of solution as a whole, and not of individual components. $\endgroup$ – Ivan Neretin Jul 5 at 11:38
  • $\begingroup$ @IvanNeretin mm yes but we might consider the solution inside the air, for instance, some times we have aerosols each particle might be considered as a solution itself containing different compounds. I think that the question might be good if the user expands it a little bit. $\endgroup$ – G M Jul 5 at 12:02
  • $\begingroup$ Air with aerosols is not a solution. $\endgroup$ – Ivan Neretin Jul 5 at 12:19
  • $\begingroup$ Smoke is (mostly) a suspension of solid particles in a gas. $\endgroup$ – ANZGC FlyingFalcon Jul 7 at 15:33

If there's water in your air, it's either in the form of water vapor (which is a gas), or water droplets (which are a liquid suspended in a gas).

Liquid water in air isn't a solution, it's a suspension.

  • $\begingroup$ or rather an aerosol, with droplets disperged in air. Dispersion of liquid in liquids is suspension. Dispersion of liquid in air is aerosol. $\endgroup$ – Poutnik Jul 6 at 7:57
  • $\begingroup$ @Poutnik I think I'd rather stick with the more general term. All aerosols are suspensions, but not all suspensions are aerosols -- rain droplets in an updraft are too large to be considered an aerosol, but they're definitely suspended (just not stably), right? $\endgroup$ – jeffB Jul 6 at 15:15
  • $\begingroup$ Rather, all aerosols and suspensions are dispersions. $\endgroup$ – Poutnik Jul 6 at 15:17

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