Why does particles remain suspended in air for a long time?
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Dust particles forms a colloidal solution with air and remain suspended. Usually colloidal solutions are formed with particles of size in the nanometre range. You should know that dust particles will not remain suspended for a very long time as in most of the colloids there is sedimentation or precipitation. But the time scale of precipitation is much larger compared to the time we observe the particles thus it seems that they remain suspended for ever. If you have gone into a room which was closed for a week or more you will find a layer of dust has been deposited on the floor and on all the surfaces. This happens as dust falls down in a undisturbed environment.
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