1 目的 演示物理学科中关于材料热膨胀(线膨胀)的原理及特性,并可以精密地比较不同材料的线膨胀大小。 2 器材 整个装置如图1所示。在一个木制底座上固定两个支架,左边支架的轴上安装着两个有机玻璃块,有机玻璃块上有一小槽口,在它们的下端有一个小弹簧与底板相连接,在弹簧的拉力下,可以使金属杆与槽贴紧。它们都可分别绕 1 Objective To demonstrate the principles and characteristics of thermal expansion (linear expansion) of materials in the physical sciences, and to accurately compare the linear expansion of different materials. 2 The entire device is shown in Figure 1. Two brackets are fixed on a wooden base. Two plexiglass blocks are attached to the shaft of the left bracket. The plexiglass block has a small notch. At the lower end of the plexiglass block, a small spring is connected to the base plate to pull the spring. The next, you can make the metal rod and groove close. They can all be individually wound