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[科学美国人60秒] 【整理】SSS 2008-02-04

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on swallow.sunny

This is Scientific American's 60-Second Science. I'm Chelsea Wald. Got a minute?
Vinegary dressing: when you shake it little vinegar droplets scatter through 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 vinegar like mixtures. So study in some mixing French researchers plan to flow water droplets one at a time through a channel a flowing oil. The channel widened in the middle so the oil would slow down and bump the water droplets together. Then the passage near it 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 started 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 that the droplets fall. That would make the droplets burst to bin and then they can merge into one big water droplet. What the researchers don't say is whether the finding could lead to a true breakthrough stay mixed salad dressing.
Thanks for the minute for Scientific American's 60-Second Science. I'm Chelsea Wald.
Humor first, Joke later...
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