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热辐射吸收本领的演示实验,是在初中物理下册第二章第七节。此实验用同一烧瓶验证两种情况,但所用时间无限制且不同时,没有对比性,再者液柱在玻璃管中移动无参考点,造成实验可信度低,说理性不强,学生有异议等缺点。为克服以上缺点,我们采用全新的设计——双烧瓶,同一时间进行,相同时间间隔内气体热膨胀,用U型管内红色液柱高度差改变的差异性,来说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。
The demonstration experiment of heat radiation absorptive power is in the second chapter of the junior high school physics. This experiment uses the same flask to verify the two conditions, but the time used is unlimited and not simultaneous, there is no comparison, and the liquid column moves in the glass tube without a reference point, resulting in low reliability of the experiment, saying that reason is not strong, students have objections Other disadvantages. In order to overcome the above shortcomings, we use a new design - double flasks, carried out at the same time, gas thermal expansion in the same time interval, with the difference in the height difference of the red liquid column in the U-shaped tube, to illustrate the black surface of the object of thermal radiation Absorption is stronger than white surfaces.