What We See as "Air" Is Actually Suspended Particles

Air Is Invisible

Air (a gas mixture) is transparent. What appears as "visible air" is light scattering by suspended particulates:

  • Dust, pollen, smoke
  • Water droplets (mist, fog, clouds)
  • Aerosols

This is the Tyndall effect. Clean air in a clean room is invisible. The blue sky is Rayleigh scattering by gas molecules (not particulates).

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