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北师大版物理八年级第一章第4节“汽化和液化”有一探究实验“水的沸腾”。课程标准只要求学生掌握水的沸腾特点,特别是水沸腾时温度不变这一知识内容。按课程标准的实验设计和建议,每一实验小组都用硬纸片盖住烧杯以节省实验时间。然而,在实验时,由于不同温度计本身存在误差,加上不同小组的硬纸片盖住杯口的密封情况不一样,因此,在实际教学中,沸水温度不稳定,学生测量沸水的温度也不一致,这就给教学带来了一定困难,如果教师硬性地讲述沸点是一致的,是不变的,就会让第一次接触物
Beijing Normal University Physics eighth grade first chapter fourth section “vaporization and liquefaction ” has a research experiment “water boiling ”. Curriculum standards only require students to master the characteristics of boiling water, especially the temperature of water boiling the same knowledge content. According to the experimental design and recommendations of the curriculum standard, each experimental group covered the beakers with cardboard to save the experimental time. However, in the experiment, due to different thermometers themselves errors, plus different groups of cardboard cover the cup of the seal is not the same, so in actual teaching, the temperature of boiling water is not stable, the temperature of the students also measure boiling water inconsistencies , Which has brought some difficulties to teaching, if teachers tell the boiling point is the same, is the same, it will make the first contact with