空气对流一般从理论上讲,空气受热膨胀上升,其周围的冷空气流来补充,完成一个。循环,正如水在连通器内一样,或如正在沸腾的水一样上下翻滚,但毕竟水是水,空气是空气,二者不尽相同,学生所得的印象也不够深刻,我在教学中利用自制教具,在讲课中进行演示,学生很感兴趣。方法是用一个长方形的纸盒,周围用纸密封起来,在其上方开二个洞,正好放下两个煤油灯玻璃罩,在演示之初,先把两个灯罩 Air convection is generally theoretically speaking, the air expands by heat, and the cold air around it complements and completes one. Circulation is like water in a communicator or tumbling up and down like boiling water. After all, water is water and air is air. The two are not the same. The student’s impression is not deep enough. I use self-control in teaching. Teaching aids, demonstrations in the lectures, students are very interested. The method is to use a rectangular box, around the paper to seal it up, open two holes above it, just put two kerosene glass cover, at the beginning of the demonstration, first two shades