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我们认为,初三物理有关“比热”的演示实验(见课本第二册P.62图3-1),有以下不足: 一、该演示实验是用两个酒精灯,分别对两个侥杯加热。由于两个酒精灯灯芯的粗细、长短及到烧杯底部的距离不一致,很难保证两个烧杯在相同的时间内吸收到相同的热量。因此,很多学生常对此提出疑问。
We believe that the third physical demonstration experiment on “specific heat” (see Figure 3-1 in Book 2 of Book 2) has the following deficiencies: 1. The demonstration experiment uses two alcohol lamps, one for each of the two. Cup heating. Due to the inconsistency of the thickness, length, and distance to the bottom of the beaker of the two alcohol lamp wicks, it is difficult to ensure that the two beakers absorb the same amount of heat in the same amount of time. Therefore, many students often question this.