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初三物理在介绍固体热膨胀的性质时,通常用“固体热膨胀演示仪”让学生观察铜棒受热时长度增加的现象。由于固体受热膨胀时长度的增加量很微小,因此,这种演示仪采用了“杠杆放大”的手段,把固体受热膨胀时长度的增加变换成一种角度的增加。在一些刊物上介绍的“光杠杆放大”演示仪。这种设计原理也是在如何“放大”铜棒长度的增加量问题上想出的办法。
When the physical properties of the solid thermal expansion were introduced in the third year of physics, the “solid thermal expansion demonstrator” was usually used to allow students to observe the increase in the length of the copper rod when heated. Due to the tiny increase in length when the solid expands with heat, the demonstrator uses a “lever-magnification” method that transforms the increase in length as the solid expands thermally into an increase in angle. The “light lever amplification” demonstrator introduced in some publications. This design principle is also a way of thinking how to “magnify” the increase in the length of the copper rod.