英語聽力文摘547 氣球不見之后發(fā)生了什么？
- 聽力原文
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High Inflation
Fairs, carnivals, festivals or anywhere you can buy helium-filled balloons, you’re sure to see at least one balloon rising into the sky after someone accidentally lets it go off.
What happens to the balloon after it rises out of sight? well,that depends on how high the balloon goes!
When you inflate a balloon, you’re actually putting gases, mostly helium,in this case , into an elastic container. As you add more gas, the pressure inside the balloon increases, and in response, the balloon expands…up to a point, that is! If you put in too much helium, and the pressure inside the balloon gets too much higher than
the atmospheric pressure on the outside of the balloon, the balloon will burst.
So what happens to a rising balloon? Well, if it gets caught by an air current and is carried along level to the earth’s surface, it could go a long way,
even across the ocean,if the winds arrived! Of course, no balloon is perfectly sealed, no matter how tightly you tie it, so eventually the helium will leak out, and the balloon will sink.
氣球不見之后發(fā)生了什么?
在集市，狂歡節(jié)，節(jié)慶日，或是在任何可以買到氦氣球的地方，你肯定能至少一次看到過一只氣球在人們不小心松手時(shí)，飛向天空。
氣球上升到肉眼看不到的高空時(shí)會(huì)發(fā)生什么事呢?這個(gè)呢，就得看看氣球升到哪個(gè)高度了!
當(dāng)你讓氣球膨脹時(shí)，實(shí)際上是把氣體，多數(shù)情況是氦氣充到一個(gè)橡膠容器里。充氣越多，氣球內(nèi)的壓力也就越大。相應(yīng)的，當(dāng)氣球膨脹到某一點(diǎn)時(shí)......答對(duì)了!如果氣球內(nèi)的氫氣太多，多到氣球內(nèi)的氣壓超過外部的大氣壓，氣球就會(huì)爆炸。
那么升到高空的氣球會(huì)發(fā)生什么事呢?如果氣球搭上了氣流這個(gè)順風(fēng)車并沿著地球表面平移，它就會(huì)飄很長一段路，甚至能穿越海洋!當(dāng)然，沒有哪個(gè)氣球是完全不會(huì)漏氣的，無論扎的多緊，球內(nèi)的氦氣都會(huì)漏光，氣球就掉了下來。
