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人教版初二物理第四章第五节《实验 :观察水的沸腾》实验。按一般的方法存在着加热时间长、水不易烧开、现象不十分明显 ,直观教学效果差等缺陷。笔者经过多年的教学实践 ,对此实验作了改进。1 常规做法的缺陷若用初温为 2 0℃左右的冷水做此实验 ,由于酒精灯加热速度慢 ,往往
The second edition of the second edition of the second edition of Physics of the People’s Education Press, “Experiment: Observing the Boiling of Water” experiment. According to the general method, there are defects such as long heating time, difficulty in boiling water, phenomena that are not obvious, and poor visual teaching effects. After years of teaching practice, the author made improvements to this experiment. 1 If the defect of conventional practice is performed with cold water with an initial temperature of about 20°C, the alcohol lamp is heated slowly, often