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气球不见之后发生了什么?

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小编摘要:在集市,狂欢节,节庆日,或是在任何可以买到氦气球的地方,你肯定能至少一次看到过一只气球在人们不小心松手时,飞向天空。

 High Inflation



At 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 has accidentally let it go.

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, in this case mostly helium, 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 exceeds 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! 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.

But what if our balloon just keeps rising? Well, eventually, it’ll burst. As you go higher into the atmosphere, the air becomes thinner, and the atmospheric pressure drops. The pressure of the helium inside the balloon doesn’t fall as quickly as the atmospheric pressure on the outside of the balloon. Before long, there’s a lot more pressure on the inside than the outside, and the balloon pops!

气球不见之后发生了什么?

在集市,狂欢节,节庆日,或是在任何可以买到氦气球的地方,你肯定能至少一次看到过一只气球在人们不小心松手时,飞向天空。

气球上升到肉眼看不到的高空时会发生什么事呢?这个呢,就得看看气球升到哪个高度了!

当你让气球膨胀时,实际上是把气体,多数情况是氦气充到一个橡胶容器里。充气越多,气球内的压力也就越大。相应的,当气球膨胀到某一点时......答对了!如果气球内的氢气太多,多到气球内的气压超过外部的大气压,气球就会爆炸。

那么升到高空的气球会发生什么事呢?如果气球搭上了气流这个顺风车并沿着地球表面平移,它就会飘很长一段路,甚至能穿越海洋!当然,没有哪个气球是完全不会漏气的,无论扎的多紧,球内的氦气都会漏光,气球就掉了下来。

但是如果气球是不断升高呢?这样的话,最终的结果是,它爆炸了。上升地越高,空气也就越稀薄,同时大气的压力就会下降。气球内的氦气压力却不会跟着大气压力这么快的下降。不一会儿,气球内部的压力超过外部大气压,气球就‘嘭’炸了。

标签:听力文摘
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2012-04-26 22:34 编辑:pliny
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  • angeloqiqi 说:

    I like balloons,especailly coloreful ones.i have never let balloons full of helium go in the atmosphere.i hate make atmospheric trash, though i really like to see that some coreful bolloons flying into the sky.

    2012-04-27 14:40 回复 支持(0) 反对(0) 沙发
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