初中物理教材《热膨胀,热传递》一章中,有一个“热辐射”的演示实验,实验表明“黑色表面的物体对热辐射的吸收能力比白色表面物体强。”若按课本中介绍的方法去做,需要用太阳光,很不方便。而且两种情况不在同一时间内完成,学生不易对比。 In the chapter “Thermal expansion, heat transfer” of the junior high school physics textbook, there is a demonstration experiment of “thermal radiation”. Experiments show that “absorption of heat radiation on a black surface is stronger than that on a white surface.” If the method is described in the textbook To do it requires the use of sunlight, which is inconvenient. And both cases are not completed at the same time, students are not easy to compare.