When you spill a bit of water onto a tabletop, the puddle spreads — and then stops, leaving a well-defined area of water with a sharp boundary. There’s just one problem: The formulas scientists use to describe such a fluid flow say that the water should just keep spreading endlessly. Everyone knows that’s not the case — but why? This mystery has now been solved — and while this phenomenon might seem trivial, the finding’s ramifications could be significant.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/ZzkbQC7AI5c/150708123326.htm
Why do puddles stop spreading?
8 julio 2015
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