2018-03-13 00:44:41 UTC
This fundamental fact explains a lot - like clouds, mist, rain, etc.
Evaporation at the ambient is essentially a monomolecular process to begin with. A random molecule gets ejected by some air molecule, so clothes dry better with wind around. Well, if that monomolecule cannot escape and remain single that way, it will unite with others in a closed space so this is why certain places appear so damp - too many multimolecules of H2O. Whether to consider these as solids floating in air, or liquids floating in air, is another story. I suppose when they are visible to the naked eye they may b4 considered liquid, but when not, as solid objects bouncing around.
Yes, water is a strange and wonderful substance.
The fact that tons of water remain above as clouds, without falling, can be explained in terms of relative density, surface tensions, and aerodynamics.
Relative density - clouds are microdroplets mixed with air and unassociated monomolecules, not yet assimilated. The less the association, higher and lighter the cloud, for it is less dense than the heavy clouds where most of the H2O monomolecules have been assimilated into the microdroplets. So in a given volume, the water, the vapour and the air nearly match the density of the not-cloud heavier air below, so the cloud with water can rest upon same.
Surface tension - this has to do with the cohesive attraction between the water particles - this sort of forms an electric skin which repulses the air molecules below the cloud. One notes that even children draw a cloud with a flat base and a fluffy top. That is becasue the bottoms of thick cloud are quite flat, from the repulsion with the heavier air below, while the tops are not that flat. This is most clearly seen at sunsets - cloud bases are usually horizontal.
Aerodynamics - There is more wind on top of the cloud than below, so there is net pressure upward, upon the cloud. This helps to keep the cloud up