when rising air, through expansion, cools to the point where some of the water vapor molecules 'clump together' faster than they are torn apart by their thermal energy. Some of that (invisible) water vapor condenses to form (visible) cloud droplets or ice crystals.

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1.
when rising air, through expansion, cools to the point where some of the water vapor molecules 'clump together' faster than they are torn apart by their thermal energy. Some of that (invisible) water vapor condenses to form (visible) cloud droplets or ice crystals.