大泡泡生小泡泡(雙語有聲)
作者：ember
來源：滬江論壇
2010-06-16 21:15
詼諧的語言，生動的內(nèi)容一分鐘快速掌握科技最新動態(tài)
Bursting Bubbles Beget Itty-Bitty Bubbles
大泡泡生小泡泡
Bubbles. Big ones entertain children and tiny ones tickle champagne aficionados. Even witches appreciate what they bring to a boiling cauldron. If you, too, are a bubble lover, then you'll enjoy the latest bubble study published in the journal Nature. In it, scientists show that a bursting bubble can leave in its wake a ring of smaller bubbles, a finding that could have implications for disease transmission.
泡泡一直惹人喜愛。孩子們喜歡大泡泡，香檳控則迷戀小細泡。就連女巫也愛欣賞她們手底冒著氣泡的大鍋。如果你也喜歡泡泡，那你一定不會錯過刊登在《自然》雜志上有關(guān)泡泡的最新研究。文章里，科學家們表明泡泡破裂時會產(chǎn)生一個由更小的子氣泡構(gòu)成的環(huán)，這一發(fā)現(xiàn)對研究疾病傳播有著重大影響。
Bubbles are engaging because of their effervescence. Here one minute and then [popping sound] they're gone. Or so we thought. What the new study shows, however, is that when bubbles break open on the surface of a liquid or solid, they don't simply disappear.
泡泡因其特性而使人著迷。前一秒鐘還在那里，下一秒就消失了。至少我們是這么認為的。然而，新研究表明不管是固態(tài)表面還是液態(tài)表面的氣泡，當它破裂時，并不是簡簡單單地消失了。
Using high-speed videography, scientists observed surface bubbles as they burst. And they saw that when the skin of the bubble ruptures, it retracts. As this film folds in on itself, it can trap air, thus forming smaller, daughter bubbles. These daughters can then do the same, leaving behind a generation of grandbaby bubbles. And so on.
科學家們通過高速攝像觀察泡泡破裂時其表面狀況。他們發(fā)現(xiàn)，當泡泡破裂時，它們的表面薄膜會往回縮，由于這層薄膜會卷起，裹進空氣，因此就形成了更小的子氣泡。子氣泡也依法炮制，留下一批更小的泡泡。以此類推。
The tinier the bubbles, the greater their internal pressure. So when these babies blow, they can disperse their contents far and wide. Which is fine if you're sipping champagne. But less welcome in a hot tub that might be full of cold and flu.
泡泡越小，內(nèi)部壓強越大。因此，當這些極小的泡泡們破裂時，便會攜帶著構(gòu)成物四處飛散。這也正是你在啜飲香檳時口感怎么會這么好的原因。不過在你泡熱水澡時，這些泡泡恐怕就不那么受歡迎了，因為它們很可能會帶走熱氣，讓你挨凍并患上感冒。
-Karen Hopkin
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