when water droplet merge tofrom a bigger drop
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Two mercury drops (each of radius 'r' ) merge to form bigger drop. The surface energy of the bigger. Answer this question and win exciting ...
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I suppose you ask about water droplets floating freely in the air. Well ... they don't really merge together. If they were, with time, fog and clouds would simply disappear from creating so big drops that the fall as rain.
When rain occurs it is not from the droplets merging but rather, from the air further cooling down by the adiabatic effect of a lesser pressure aloft. Hence, all rain and snow happens first upward. It is only when their mass become so great that they overcome the rising by gravitation that the fall down. In that process, then they do meet smaller droplets and merge.
But first, the must grow bigger by condensation and that happens because the molecule of moisture in the air have virtually no mass and can only condense when touching anything with a mass like, a corn of dust, a smoke particle or ... an already existing drop.
The process of condensing causes a release of thermal energy that can only be dissipated when touching something with a mass. This is why you may see dew, early in the morning, on anything with a mass like, the branch of a tree or your car.
Or else, water simply evaporates. It happens all the time, naturally: the sea evaporates and so do clouds. It is only clouds that are rising that keeps their size, or increase it to produce precipitat
Best Answer
I suppose you ask about water droplets floating freely in the air. Well ... they don't really merge together. If they were, with time, fog and clouds would simply disappear from creating so big drops that the fall as rain.
When rain occurs it is not from the droplets merging but rather, from the air further cooling down by the adiabatic effect of a lesser pressure aloft. Hence, all rain and snow happens first upward. It is only when their mass become so great that they overcome the rising by gravitation that the fall down. In that process, then they do meet smaller droplets and merge.
But first, the must grow bigger by condensation and that happens because the molecule of moisture in the air have virtually no mass and can only condense when touching anything with a mass like, a corn of dust, a smoke particle or ... an already existing drop.
The process of condensing causes a release of thermal energy that can only be dissipated when touching something with a mass. This is why you may see dew, early in the morning, on anything with a mass like, the branch of a tree or your car.
Or else, water simply evaporates. It happens all the time, naturally: the sea evaporates and so do clouds. It is only clouds that are rising that keeps their size, or increase it to produce precipitat
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