“空气占据空间，是小学自然第五册中较重要也较难教的一课。如何让学生从实验中得出‘“空气占据空间”这一结论，按教材所述的实验，“纸团塞到杯底，倒扣在水中，纸团不湿”，有些学生掌握不好，纸团掉下来落到水里湿了，也有学生认为杯中还有纸，不能精确说明杯子的空... “The space occupied by air is one of the more important and harder lessons taught in the fifth volume of primary school nature.How to let students come to the conclusion that” air occupies space “from the experiment, according to the experiment described in the textbook, Stuffed to the bottom of the cup, inverted buckle in the water, the paper ball is not wet, ”some students do not master well, the paper fell into the water wet, and some students think there is paper in the cup, can not accurately explain the empty cup. .