Mountain Puzzles
Mountain Puzzles
what holds a rain cloud in the sky?
we have all learnt from elementary geography that rain forms after the condensation of moist air that rises from the earth’s surface. There are other ways by which it may form, such as by the rise of air over high obstacles, such as a mountain. Anyway, the cloud forms and when it is heavy enough, it falls as rain, in droplets.
Now, what is puzzling is the fact that the rain falls in droplets. My question is, if the cloud is heavy enough to fall as rain, why does it not fall at once as a single mass? I dont understand why the same cloud should fall as small rain drops for a whole thirty or so minutes. What continues to support its weight up there?
Clouds are formed by air which rises and condenses, like you said. This rising air is what in fact keeps the clouds in the air and part of the reason it does not fall all at once.
In order for droplets (or, in most cases in the midlatitudes, ice crystals which melt) to fall as rain, they need to grow to a size large enough so that their downward force (mass*gravity) is enough to overcome both air resistance and the upward motion of the cloud itself. Eventually, evaporative cooling will cause the air to become more dense and the cloud will have a downdraft instead of an updraft, and it’s life cycle as a shower is nearing an end.
Drops are not created equal in size. They crash into each other, breaking large droplets into small droplets which can no longer overcome the upward motion and air resistance. Small droplets overtake even smaller droplets as they fall. Fall speed will depend on the size of the droplet, and all the droplets will be falling at different speeds, some won’t be falling at all.
This is a pretty simplified version of it all. Here is a USAToday article that you might find interesting. Do a search for the word “hold” and you should find something that is kinda related: http://www.usatoday.com/weather/resources/askjack/archives-clouds-precip.htm
White Mountain.mpg
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