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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 Seconds Science, I’m Chelsea Wald, got a minute?
Vinegary dressing, when you shake it, little vinegar drop would scatter through the oil, but when you put it down, the droplets merge and the dressing separates. That’s probably not a big intervenient to you but it is the industry that uses lots of vinegar like mixtures. So the studies on mixing French researchers plan to flow water droplets wonder the time through a channel of flowing oil. The channel widens in the middle so the oil would slow down and bump the water droplets together. Then the passage neared again so the oil would speed up and pull the droplets apart. The researchers expected that the droplets would merge when they bumped together. But that’s not what happened. In fact, it was when the droplets start to pull apart from each other that they suddenly mixed. In physical review letters the researchers say that the pulling apart may make the pressure between the droplets fall, that would make the droplets burst to bin and then they could merge into one big water droplet. What the researchers don't say is whether this finding could lead to a true breakthrough, stay in mixed salad dressing.
Thanks for the minute for Scientific American’s 60 Seconds Science. I’m Chelsea Wald.
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