第二十一课 Lesson Twenty One 沸腾 boiling 1.给水加热，会有什么发现？ When you heat the water, what do you find？ 2.水开后，继续加热一段时间，观察有什么变化。 After the water boils, keep the heat on for some time to see what happens. 3.做好记录 recorded 4.时间（分钟） Time (minutes) 5.温度（℃） Temperature (℃) 6.观察到的现象 Observed phenomena 7.我想再做一次实验 I want to do the experiment again 8.温度（℃） Temperature (℃) 9.时间（分钟） Time (minutes) 10.把实验中搜集的信息进行分析、归纳。 Analyze and summarize the information collected in the experiment. 11.我们从中发现了什么？ What do we find? 12.在一定的外界条件下，液体被加热到一定温度时，内部出现大量气泡。 Under certain external conditions, when the liquid is heated to a certain temperature, a large number of bubbles appear inside. 13.气泡迅速胀大，上升到液面后释放大量蒸汽，整个液体发生剧烈汽化。 The bubbles swell rapidly and release a large amount of steam when they rise to the liquid level. The whole liquid vaporizes violently. 14.这种现象叫做沸腾。 This phenomenon is called boiling. 15.如继续加热，液体温度不在上升，此时温度称为液体的沸点。 If heating continues, the temperature of the liquid does not rise, and the temperature is called the boiling point of the liquid. 16.在高山上和海边烧水，水的沸点是一样的吗？ Does water boil at the same point on a high mountain as it does by the sea? 17.查阅资料了解吧！ Access to information to understand it! 18.制作“蒸汽动力机”。 Make "steam engine". 19.下面这个故事给我们什么启示？ What does the following story tell us? 20.资料卡 The data card 21.瓦特改良蒸汽机 Watt improved the steam engine 22.瓦特是一个科研成果丰硕的科学家，他勇于探索，对发明创造很感兴趣。小时候，他看见水壶里的睡烧开时，壶盖被蒸汽顶起来，一上一下地掀动着…… Watt was a prolific scientist with a passion for exploration and a passion for invention. When he was a child, he saw the kettle boiling, the lid of the kettle was pushed up by the steam, up and down the ground shaking... 23.瓦特心想：把蒸汽用来做各种机械的动力，不是可以节约许多人力吗？ Watt thought to himself, Wouldn't it save a lot of manpower to use steam as the power for all kinds of machines? 24.他长大后，在修理蒸汽机时，发现当时的蒸汽机有许多需要改进的地方，于是决心自己来制造一种蒸汽机。 When he grew up and repaired the steam engine, he found that there was much to be improved, so he decided to make a steam engine of his own. 25.他反复实验，经历了无数次的挫折和失败，终于制造出了一台性能优良的蒸汽机。 He experimented repeatedly and experienced numerous setbacks and failures, and finally produced a steam engine with excellent performance. |
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