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初中物理课本上的对流实验存在着可视性差、演示时间短,不能重复演示的问题.若采用锡箔和甘油做对流实验,能较好地解决上述问题.实验的具体方法是,依需要选用无色玻璃容器(烧杯、广口瓶等)底部涂二道红色,容器内注入适量甘油(或适当浓度盐水).再加入适量的锡箔.(将香烟锡纸包装揭去衬纸剪碎即可)盖上盖子置于支架上.支架下为热源和光源-用铁片或硬纸片围住四周的灯泡(如图1),灯泡依需要可选用
The convection experiment in junior high school physics textbooks has the problems of poor visibility, short presentation time, and inability to repeat presentations. If the use of tin foil and glycerin as convection experiments can solve the above problems better, the specific method of the experiment is to use The glass container (beaker, jar, etc.) is coated with two red bottoms, and the container is filled with an appropriate amount of glycerin (or a suitable concentration of salt water). Then, a suitable amount of tin foil is added. (The tin foil paper packaging can be peeled off and the liner paper can be cut into pieces) Cover The upper cover is placed on the support. The heat source and the light source are under the support. The light bulb is surrounded by iron or hard paper (see Figure 1). The light bulb can be used as required.