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[科学美国人60秒] 【整理】SSS 2008-02-04

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This is scientific American’s 60-second science. I’m C.W. got a minute?

Vinaigrette dressing: When you shake it, little vinegar droplets scatter to the oil. But when you put it down, the droplets merge and the dressing separates. That’s probably not a big inconvenience to you, but it is the industries that use lots of vinaigrette like mixtures. So to study the some mixings, French researchers planed to flow the water droplets. One at a time through a channel flowing oil. The channel widened into the middle, so the oil would slow down and bump the water droplets together then the passage near the road again. So the oil would speed up and pour the droplets apart. The researcher is expected that the droplets would merge when they bumped together. But that’s not what happened. In fact it was when the droplets started to pour apart from each other that they suddenly mixed. In physical review letters, the researchers say that pouring apart may mean the pressure between the droplets fall that would make the droplets burstdurban and then they can emerge into one big water droplet. What researchers don’t say is whether this finding could lead to a true breakthrough- stay mixed salad dressing.

Thanks for a minute for scientific American’s 60-second science. I’m C.W.
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