This article in the NY times breifly discusses an experiment conducted at MIT. They wanted to see how time and surface affects the way a water drop dries up after impact. They used different surfaces ranging from very smooth, to very rough and found that smooth surfaces upon impact allow the water droplet to bounce back and keep most of its form. A more rough surface however, does the opposite and breaks the water drop into many smaller drops that move away from each other. Because the water drop diffuses and seperates more under the rough surface, it dries much faster in comparison to the smooth surface.
Russell Ram
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