【英语时差8,16】防火气球-上（在线收听）

Wanna see a trick? Sure. Here, blow up this balloon. Ok, now what? Now, I light this candle. Now what do you think will happen if I put the flame under the balloon? It’ll pop, of course. The flame will heat the rubber to the point where it becomes weak and can’t hold up under the pressure from the air inside. Right, except not always. What do you mean? Watch, first I'll put about a quarter cup of water in the balloon and blow it up. There, now hold this while I light another candle. This is the trick, right? You pop it and I get wet.