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SSS 2008-06-19

时间:2010-05-14 02:40来源:互联网 提供网友:0922013129   字体: [ ]
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This is Scientific American's 60-Second Science, I am Karen Hopkin. This'll just take a minute.

Physicists1 study all kinds of curious things,from the missing matter in the universe to the strange behavior of electrons ,but none of this is  quite as curious or dramatic as what happens when you drop a Mentos into a bottle of Diet Coke. You've probably run across the Youtube videos ,a person often wearing a lab coat  and goggles,plops a mint into a bottle and woosh, a foamy2 jet of sticky soda3 sprays 20 feet into the air. Now physicists from North Carolina think they know why.They repeated the reaction using a variety of catalysts4, from the classic Mentos to table salt,as well as a handful of solvents5 including caffeine-free coke and Seltzer.They found that what's going on is physics not chemistry. The rougher the stuff that gets dropped into the fluid ,and the faster it sinks,the more spectacular the eruption6.Microscopic7 nooks and crannies encourage the growth of carbon dioxide bubbles. That carbonation fuels the geyser .And things that sink quick create lots of bubbles that seed even more bubbles as they rise. The explosive results appear in the June issue of the American Journal of Physics.It's not rocket science unless the bottle is upside down. 

Thanks for the minute for Scientific American's 60-Second Science, I am 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 foamy 05f2da3f5bfaab984a44284e27ede263     
adj.全是泡沫的,泡沫的,起泡沫的
参考例句:
  • In Internet foamy 2001, so hard when, everybody stayed. 在互联网泡沫的2001年,那么艰难的时候,大家都留下来了。 来自互联网
  • It's foamy milk that you add to the coffee. 将牛奶打出泡沫后加入咖啡中。 来自互联网
3 soda cr3ye     
n.苏打水;汽水
参考例句:
  • She doesn't enjoy drinking chocolate soda.她不喜欢喝巧克力汽水。
  • I will freshen your drink with more soda and ice cubes.我给你的饮料重加一些苏打水和冰块。
4 catalysts 677fdea123458fc2ff92eb84d07254e9     
n.催化剂( catalyst的名词复数 );触媒;促进因素;有感染力的人
参考例句:
  • The first catalytic converters were called conventional oxidation catalysts. 最初的转化器叫做常规氧化催化器。 来自辞典例句
  • Many processes that are essential to the chemical industry use heterogeneous catalysts. 很多重要的化学工业过程就是使用多相催化剂的。 来自辞典例句
5 solvents 034b168fe60271d2a244d289076119b4     
溶解的,溶剂
参考例句:
  • It is resistant to borohydride reduction in alcoholic solvents. 在醇溶剂中,它不能被硼氢化物还原。
  • Strains require special treatments for removal such as spotting with organic solvents. 要清除这些着色物质,需要特殊处理,例如:滴加有机溶剂。
6 eruption UomxV     
n.火山爆发;(战争等)爆发;(疾病等)发作
参考例句:
  • The temple was destroyed in the violent eruption of 1470 BC.庙宇在公元前1470年猛烈的火山爆发中摧毁了。
  • The eruption of a volcano is spontaneous.火山的爆发是自发的。
7 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
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