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SSS 2009-07-21

时间:2010-05-18 03:31来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American's 60-Second Science. I'm Karen Hopkin . This will just take a minute.

 

When you get caught in a downpour, you probably don’t think about the size of the raindrops that assault you as you run for cover. But physicists1 do. And they’ve come to the conclusion that the drops that hit the ground, or your head, are the shattered remains2 of bigger drops that fell from the clouds.

Raindrops come in a variety of sizes, even within the same storm. And scientists used to think that, to get that kind of distribution, raindrops must crash into each other on the way down, breaking up into smaller droplets3 or coalescing4 into larger ones. Now a team of French scientists has produced high-speed footage of falling water droplets. And they find that drops of different dimensions don’t require collision—they come from the fragmentation of individual, isolated5 droplets. Their results appear online in the journal Nature Physics.*

The video evidence reveals that water droplets first flatten6 out as they fall. And as these plummeting7 pancakes get wider and thinner they eventually capture air, forming what look like little plastic grocery bags floating in a breeze. And when the bags get big enough, they pop. And you’re left wondering why you can never remember your umbrella.

 

Thanks for the minute, for the Scientific American's 60-Second Science. I'm Karen Hopkin
 


点击收听单词发音收听单词发音  

1 physicists 18316b43c980524885c1a898ed1528b1     
物理学家( physicist的名词复数 )
参考例句:
  • For many particle physicists, however, it was a year of frustration. 对于许多粒子物理学家来说,这是受挫折的一年。 来自英汉非文学 - 科技
  • Physicists seek rules or patterns to provide a framework. 物理学家寻求用法则或图式来构成一个框架。
2 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
3 droplets 3c55b5988da2d40be7a87f6b810732d2     
n.小滴( droplet的名词复数 )
参考例句:
  • Droplets of sweat were welling up on his forehead. 他额头上冒出了滴滴汗珠。 来自辞典例句
  • In constrast, exhaled smoke contains relatively large water droplets and appears white. 相反,从人嘴里呼出的烟则包含相当大的水滴,所以呈白色。 来自辞典例句
4 coalescing b795440b9ade4378fef3486b241378bc     
v.联合,合并( coalesce的现在分词 )
参考例句:
  • A mental model begins coalescing in their minds. 一个意识模型开始结合到他们的脑子里。 来自互联网
  • On the basis of coalescing this kind of element can separate oil from compressed air. 采用凝聚原理,分离压缩空气中的油份。 来自互联网
5 isolated bqmzTd     
adj.与世隔绝的
参考例句:
  • His bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • Patients with the disease should be isolated. 这种病的患者应予以隔离。
6 flatten N7UyR     
v.把...弄平,使倒伏;使(漆等)失去光泽
参考例句:
  • We can flatten out a piece of metal by hammering it.我们可以用锤子把一块金属敲平。
  • The wrinkled silk will flatten out if you iron it.发皱的丝绸可以用熨斗烫平。
7 plummeting a560b06f9b99975167411b72966f5588     
v.垂直落下,骤然跌落( plummet的现在分词 )
参考例句:
  • Prices are rising, falling, going up, going down, shooting up, plummeting, etc. 物价在上涨、下跌、上升、下落、猛然上涨、骤然下跌等。 来自辞典例句
  • The enemy plane went plummeting into the sea. 敌机直直掉进海里。 来自辞典例句
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