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cloud and fog physics
   
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SUMMARY

The Equilibrium Vapor Pressure over water is greater than that over ice and therefore in a cold cloud, the water will be out of vapor pressure equilibrium and will evaporate to reach equilibrium. The ice will condense this vapor and grow into a larger ice crystal.

Eventually this ice crystal will grow large enough to fall. It may even collide with other ice crystals and grow larger still through collision Coalescence .