Wednesday, January 18, 2012

What Holds Clouds in Place?

I am curious. Why should clouds group together in the sky? Why do the edges of clouds always look like they are slowly evaporating away?  The edges of clouds always appear to be moving away from the main mass of cloud. How come we never see them moving in toward the cloud?  Perhaps clouds form due to surface tension, like how oil forms into globules when floating in water. But then why don't clouds have smooth rounded edges like oil globules?

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