I understand that fog is denser mist, and that essentially, it’s all just water vapour. But so are clouds. So why is water vapour sometimes at ground level? Why is it only sometimes? Why is it usually albeit not always at night? What makes it happen? And what makes it NOT happen?
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Fog is literally a cloud at/near ground level. The water droplets are so small that they’re much more affected by air current than gravity. Most is slightly larger water droplets, still small enough to be significantly influenced by air currents, but starting to become large enough to be readily pulled to the ground by gravity. As these droplets get larger (naturally occuring), they’ll turn to rain, where they’re so large they’re primarily influenced by gravity, with air currents only mildly affecting them.
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