丁铎尔实验可以生动地证明功能够转变为热。但是,用乙醚做此实验存在以下几个问题: 1、实验时间较长,约需2～3分钟。在这段时间里要不停地用力迅速拉绳子,劳动强度较大。 2、乙醚药品价格较贵,农村学校使用和购买都有困难。 3、乙醚气味难闻,影响学生听课情绪。 4、实验室时乙醚用量的多少不易掌握。我们对此实验进行了改进,方法是:用 The Dinger experiment can vividly prove that the work can be transformed into heat. However, there are several problems with this experiment with ether: 1. The experiment takes a long time and takes about 2 to 3 minutes. During this period of time, we must constantly pull the rope quickly and laboriously. 2. Ether drugs are more expensive and they are difficult to use and purchase in rural schools. 3, ethyl ether odor, affecting students’ mood. 4, the amount of ether in the laboratory is not easy to grasp. We have improved this experiment by: