《科学课》总第151期刊登了顾元文老师的《固体热胀冷缩演示仪》的制作和演示方法,本人根据教学经验,对该演示仪的制作作了适当的修改,使之材料更易得且能对固体、液体、气体进行热胀冷缩演示。制作方法1.用3×5方木料和一块30×20的三合板制作一个“h”形的架子(尺寸见图示1, According to the teaching experience, I made some modifications to the presentation of the demonstrator to make it easier to get the materials And solid, liquid, gas thermal expansion and contraction demonstration. Production methods 1. Use 3 × 5 square timber and a 30 × 20 plywood to make a “h” -shaped shelf (size shown in Figure 1,