Paper burning boat

Haiyan Sanmao National Small Five Class Shen Zining

This afternoon, Teacher Xu brought in the things to be used in the science class. The students were very strange and thought that Teacher Xu would give us a science class.

Teacher Xu looked at us very strangely, and smiled and told us to do an experiment on a paper-burning boat today. The students were both curious and excited, waiting for Teacher Xu to give us an experiment. Before doing the experiment, Teacher Xu asked us a question. He asked: "Will you put water in the paper boat and burn the paper boat with fire?" The students talked a lot, some said it would, some said it would not The classmates who are still said may be. We started the experiment with questions.

I saw that Xu put the asbestos net on the tripod first, then placed the paper boat on the asbestos net, poured water into it, and finally started the burning with the match. The students looked at each other with great concentration, and they were afraid that the paper boats would burn. Everyone was very worried. Some of the students were wide-eyed and looked at the paper boats. Some students couldn’t close their mouths for a long time. Some students held their eyes. Breathing even the atmosphere did not dare to go out, and some students were talking about whether the paper boat was burning... and Teacher Xu was calmly looking at the paper boat, a look of nothing. One minute passed, two minutes passed, the water in the paper boat had already warmed up, and some steam had emerged. Some students said, "Is it already burning?" After a while, Teacher Xu put the alcohol lamp The fire went out, and two students were asked to come up and feel the temperature of the water. I also looked at the paper boat, but the paper boat is still safe and sound. The students said very strangely: "How can this be?" At this time, the teacher asked us: "Why is the paper boat added water and the paper boat is not burning?" Many students said the reason, but Zhao Lifan said the most specific He said: "In fact, the mystery of this experiment is because the water is added inside, so that the paper boat is cooled, and the ignition point is not reached. If the water evaporates, it will burn.

The truth was revealed, and the students listened to Zhao Lifan’s explanation.