在初中物理第二册《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本领比白色表面的物体强”。若按课本上的图2—19所示去做,需要用太阳光,很不方便。 为了不受太阳光的限制,提高演示实验的可见度,我在教学中对“热辐射”演示实验做了改进,收到了良 In the second volume of the junior high school physics book “Thermal expansion heat transfer”, there is a demonstration experiment of “heat radiation”. Experiments have shown that “absorption of heat radiation by objects with black surfaces is stronger than that of objects with white surfaces”. If you do this as shown in Figure 2-19 of the textbook, you need to use sunlight, which is inconvenient. In order to avoid the limitation of sunlight and improve the visibility of demonstration experiments, I improved the “heat radiation” demonstration experiment in teaching and received good results.