介绍绝缘体变为导体的实验两则

“导体和绝缘体之间没有绝对的界限,在一定的条件下绝缘体也可以变成导体。一般条件下不导电的玻璃,当温度升高到一定程度时也会变成导体”。按照课本的要求,玻璃球作实验材料有一定缺陷。可以用废小灯泡、或盐水溶液来替代玻璃球来做实验,其结果是,材料易得,操作简便。效果更好。

Two Experiments to Transform Insulator to Conductor

"The conductor has no absolute boundary with the insulator. Under the certain condition, the insulator can also become the conductor. General speaking, the glass that does not conduct electricity will also become the conductor when the temperature goes up to certain extent. " According to the text, it has some defect to have the glass ball as experiment material. Small bulbs, or the salty solution can be substituted for the glass in the experiment. It turns out that a better result will be obtained since the materials can be easily got, and the operation course can be so convenient as well.