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初中物理“比热”一节是教学中的难点。近二年来,我们对这节课的教学进行了一些改革性的探索,现简介如下。一、实验装置的改进课本的实验是“拿两个同样的烧杯,分别装上质量和温度都相同的水和煤油,用两个同样的酒精灯给它们加热。”通过观察得出煤油的温度比水的温度升得快。要使水升高的温度跟煤油的相同,就得给水加热较长的时间。从而导出比热的概念。但实际上完全相同的酒精灯很难找到。故一些学生对
The “specific heat” section of junior high school physics is a difficult point in teaching. In the past two years, we have carried out some reform explorations on the teaching of this lesson. The brief introduction is as follows. First, the improvement of the experimental device The experiment of the textbook is to “take two identical beakers, respectively install water and kerosene of the same quality and temperature, and heat them with two identical alcohol lamps.” The temperature of kerosene is obtained through observation. It rises faster than the temperature of water. To make the water rise at the same temperature as kerosene, you have to heat the water for a longer period of time. This leads to the concept of specific heat. But in fact the exact same alcohol lamp is hard to find. So some students are