利用投影仪演示水的反常膨胀通城双龙学校吴忠甫（４３７４００）我们知道水的膨胀随温度变化不大，所以一般的“水的反常膨胀”实验可见度小，现象不明显，不利于学生的观察，影响了教学效果。为了改变这种状况，我自制了一个水的反常膨胀装置，借助投影仪进行演示，取得... Using projectors to demonstrate the abnormal expansion of water in Tongcheng Shuanglong School Wu Zhongyu (437400) We know that the expansion of water does not change much with temperature, so the general “abnormal expansion of water” experiment has a small visibility, and the phenomenon is not obvious, which is not conducive to student observation. Affects the teaching effect. In order to change this situation, I made a self-contrast expansion device for water, demonstrated with a projector, and achieved...