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I'm so glad you're still having fun with that balloon, Squeaks!
我很高兴你还在玩那个气球，吱吱！
Oh right! We did almost lose it earlier today
哦,对!今天早些时候我们差点把它弄丢了
We were in the pizza store getting some lunch, and the balloon slipped out of Squeaks'paw!
我们在比萨店吃午饭，气球从吱吱的爪子里滑了出来!
It went up to the ceiling, but the string was hanging down far enough that I could grab it back
它上升到天花板，但绳子挂得足够远，我可以把它抓回来
Then we tied it to a water bottle from my backpack so it wouldn't get away again
然后我们把它绑在我背包里的水瓶上，这样它就不会再跑掉了
It’s a good thing it didn't escape while we were outside!
好在我们在外面的时候它没逃出来!
Well, a couple of different things can happen to a balloon that escapes into the sky —
嗯，气球逃到天空中会发生一些不同的事情
the regular type of balloon, I mean, that's made out of the stretchy rubber stuff
普通的气球，我是说，是用有弹性的橡胶做的
First, the balloon starts to rise higher and higher into the air
刚开始，气球开始升得越来越高
That's because balloons aren't filled with regular air, like the kind we breathe
因为气球里的气体和我们呼吸的气体并不相同
They're filled with something called helium, and it makes the balloon lighter for its size than the air around it
它们充满了一种叫做氦气的东西，这使得气球比周围的空气更轻
So it starts to float on the air, just like certain things float on water
所以它开始漂浮在空中，就像某些东西漂浮在水上一样
If you try to push a plastic spoon to the bottom of a bowl of water, the spoon will just float to the top again
如果你试图把一个塑料勺推到一碗水的底部，勺子会再次浮到顶部
If someone lets go of a helium balloon outside, it starts to rise through the air like the spoon at the bottom of the bowl rises through the water
如果有人把氦气球放出去，它就会像碗底的汤匙从水里升上来一样从空中升起
But unlike the small amount of water in the bowl, there's lots of air all around us, and it stretches up really high in the sky
但和碗里的少量水不同的是，我们周围有很多空气，它在天空中伸展得很高
So the balloon keeps floating higher and higher and higher
所以气球一直飘得越来越高
And as it goes higher, the air around it starts to change
当它上升的时候，周围的空气开始改变
The higher into the sky you go, the less air there is
飞得越高，空气就越少
There's still some air, but it becomes more spread out
仍然有一些空气，但它变得更分散
And as the air outside the balloon spreads out, the helium inside the balloon starts to spread out, too, pushing out on the inside of the balloon
当气球外面的空气向外扩散时，气球里面的氦气也开始向外扩散，推动气球内部
What happens next depends on the strength of the stuff the balloon is made of
接下来会发生什么取决于气球材料的强度
If the balloon isn't very strong, the helium pushing on it will pop the balloon before it gets too high up
如果气球不够结实，氦气就会在气球飞得太高之前把它吹爆
Then the pieces just fall back down to the ground
然后碎片又掉到地上
That's why it’s usually not a good idea to send balloons into the sky on purpose
这就是为什么故意把气球送上天空通常不是一个好主意
When they come back down in those big pieces, they can hurt animals that think they're food and try to swallow them
当它们回到地面时，它们会咬伤那些认为自己是食物的动物，并试图吞下它们
But if the balloon is stronger, something different will happen
但如果气球更强，就会发生一些不同的事情
It will keep floating higher and higher up into the air — sometimes even as high as an airplane!
它会在空中越飞越高——有时甚至像飞机一样高!
But the air very high up in the sky isn't just more spread out — it's also much colder
但是天空中很高的空气不仅仅是更分散，而且更冷
When you're as high up as airplanes go, it's freeeeezing
当你飞得和飞机一样高的时候，会非常非常冷
And when rubber gets cold, it becomes stiffer and less stretchy
当橡胶变冷时，它会变得更硬，不那么有弹性
So eventually, with the cold combined with the helium pushing on it from the inside, the balloon can actually /shatter/, breaking into super tiny little pieces
所以最终，在寒冷和氦气从内部推动下，气球实际上可以/打散/，分裂成非常小的碎片
Those also fall back down to the ground, but since they're so small you probably wouldn't be able to see them
它们也会掉到地上，但由于它们太小，你可能看不到它们
Whether it pops or shatters, the balloon always does two things: it goes up very high, as far as it can go!
不管气球是如何破的，它总是做两件事:它飞得很高，越高越好!
And then it comes back down
然后它回来了
That's actually what happened to your balloon too, Squeaks!
你的气球也是这样，吱吱!
Except, since we were inside, it could only go as high as the ceiling, and then we were able to pull it back down
只是，因为我们在里面，它只能飞到天花板那么高，然后我们就能把它拉下来
Have you ever lost a balloon?
你曾经丢过气球吗？
What do you think happened to it?
你认为气球会发生什么？
Ask a grownup to help you leave a comment below, or send us your questions through our website at patreoncom/scishowkids
请一个成年人帮你在下面留言，或者通过我们的网站patreoncom/scishowkids把你的问题发给我们
We'll see you next time here at the Fort!
我们下次在堡垒见！
