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初中物理教材第二册62页的比热演示实验,在多次教学实践中,发现实验设计存在一个缺陷——要让两烧杯中等质量的水、煤油吸收到相同的热量,而用两个酒精灯同时进行加热。由于外焰凭教师主观调节不能保证吸收热量相等,这样实验设计固然不行,针对这点我作了如下改进:用两支试管分别代替两烧杯作容器,温度计固定
The specific heat experiment of the junior middle school physics textbook Book 2 of Volume 62, found that in the practice of teaching many times, there was a flaw in the experimental design - two beakers of medium-quality water and kerosene were absorbed to the same amount of heat and two alcohols were used. The lamp is heated at the same time. Since external flames can’t guarantee the same amount of absorbed calories with the subjective adjustment of teachers, this experimental design is not. For this purpose, I made the following improvements: replace the two beakers with two test tubes as containers, and the thermometers are fixed.