【英语时差8,16】防火气球-下（在线收听）

 No, trust me, the balloon won’t pop! It better not. see? Wow!you are right. How come it not poping? As long as the flame is beneath the water in the balloon, the water absorbs most of the heat and the rubber doesn’t get very hot. But won't the water eventually get hot enough to break the rubber? Eventually, but it will take a while. Water has a really large specific heat, meaning that it takes a lot of heat to make water boil, and even more heat to make it vaporize. In fact, it takes about 540 calories of heat to evaporate one gram of water. well, it hasn't poped yet. Of course, if I move the flame to another part of the balloon.... Dohn, I'm all wet. Sorry, I couldn't resist.