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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.
在集市，嘉年華，節日聚會還有任何其他地方你都能買到氫氣球，你至少能看到一個氣球由于有人沒有拿好，意外讓氣球飛向高空的情況。
What happens to the balloon after it rises out of sight? Well,that depends on how high the balloon goes!氣球飛到看不見的地方會發生什么呢？嗯，這取決于氣球飛到多高的地方！
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.
當你給氣球充氣的時候，你充的一定是氣體，大多是氫氣，到一個有彈性的容器內。你加入的氣體越多，氣球內部的壓力也隨之增長，相應地，氣球變大了……到了一定的大小，就是那個狀態下，如果你充入更多的氫氣，氣球內部的壓力就比氣球外面的大氣中的壓力大，氣球就會保障。
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.
所以一個不斷向上升的氣球會怎么樣呢？嗯，如果它遇到氣流被帶到地球表面，這樣可以走很遠。如果有風，它甚至可以越過海洋！當然，不論怎么扎緊氣球，沒有氣球是完全不會漏氣的。因此最終氫氣會泄露，氣球會下沉。
