Quote:
Originally Posted by neilzero
How can single water vapor molecules form ice, if they rarely pass within a milimeter of each other, even at 100 degrees k? Neil
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Formation of condensed water in clouds is complicated and still being studied, but what often happens is that solid dust particles act as "condensation nuclei" which allows the water molecules to freeze onto the surface of the particles. The ice particles then grow larger as more water molecules freeze onto the growing ice particle.
Bob Clark