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做好萘熔解与凝固的演示实验,是教师上好现行初中物理《熔解和凝固》一节课,让学生了解晶体、非晶体的概念,掌握晶体熔解与凝固的规律的关键。使用热敏温度计及配套演示用大型电表代替液体温度计(其它装置仍照《教学参考书》第二册93页做),是很好的改进。但是演示电表的可见度还不够大,后面的同学仍看不清与0℃至100℃相对应的较密的刻度线;而且教室两边
The demonstration experiment of the fusion and solidification of naphthalene is a good lesson for teachers in the current junior high school physics “melting and solidification” lesson. It is crucial for students to understand the concepts of crystals and non-crystals and master the laws of crystal melting and solidification. The use of thermal thermometers and large-scale electric meters for demonstrations instead of liquid thermometers (other devices are still done according to the “Teaching Reference Booklet, Volume II, p. 93), is a very good improvement. However, the visibility of the demo meter is not large enough, and the students still can’t see the denser scale lines corresponding to 0°C to 100°C;