教材中关于失重演示实验由于要在运动中进行观察,且实验现象不可能持续很长时间,导致学生观察困难,很难理解失重原理,从而影响了教学效果。为此,笔者经过不断地实践,对教材上的实验进行了如下改进。一、器材准备一个大圆管(可以采用建筑上使用的直径为200~300 mm的PVC管,长度40 cm左右);两张大的白色吸水纸,要可以方便地衬在圆管内壁,若不能固定,则可用透明胶固定;一个大的塑料饮料瓶,不要瓶盖,在瓶的侧壁下部开一个直径约2 mm的小孔;足量红色的水。二、实验原理液体由于受到重力作用,会有向低处流的特性。当饮料瓶中装满红水时,由于重力作用,水将会从小孔 Textbook on weightlessness demonstration experiment due to be observed in the movement, and the experimental phenomenon can not last a long time, leading to students difficult observation, it is difficult to understand the principle of weight loss, thus affecting the teaching effectiveness. To this end, the author after continuous practice, the experiment on the teaching materials were improved as follows. First, the equipment to prepare a large pipe (the diameter of the building can be used 200 ~ 300 mm PVC pipe, length 40 cm or so); two large white absorbent paper, you can easily lining the pipe wall, if not fixed , You can use transparent plastic fixed; a large plastic beverage bottle, do not bottle cap, open a small hole in the lower part of the sidewall of the bottle about 2 mm in diameter; sufficient red water. Second, the experimental principle Liquid due to gravity, there will be low flow characteristics. When the beverage bottle is filled with red water, water will flow from the hole due to gravity