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在教“空气占据空间”一课时,我设计制作了空气占据空间实验器,并用于教学,收到了良好的效果。具体是在橡胶皮塞上打两个小圆孔,用一根与小圆孔等大的玻璃管从橡胶皮塞的一个小圆孔中穿插过去(密封),在橡胶皮塞的玻璃管上套一只小气球,用细线绑紧,然后把气球放进可乐瓶中,用橡胶皮塞塞紧瓶口(图1)。实验时,先将手指把橡胶皮塞的小圆孔堵住,用嘴对着玻璃管口吹气球,此时,气球很难吹胀,而且可乐瓶被胀得鼓鼓的,嘴一离开玻璃管口,可乐瓶立即恢复原状,由此说明空气占据了空间。然后手指松开,再用嘴对着玻璃管口吹气球,气球很容易吹胀。与此同时,从橡胶皮塞的小圆
In teaching “Air Occupied Space” lesson, I designed and produced a space experimenter for air, which was used for teaching and received good results. Specifically, two small round holes are drilled on the rubber plug, and a large glass tube with a small round hole is used to insert (seal) past a small round hole of the rubber plug, on the glass tube of the rubber plug. Set a small balloon and tie it tightly with a thin thread. Then put the balloon into the Coke bottle and use a rubber stopper to close the bottle (Figure 1). In the experiment, the fingers were used to block the round hole of the rubber plug and blow the balloon against the glass mouth with the mouth. At this time, the balloon was difficult to inflate, and the bottle was bulging and the mouth was left with glass. At the mouth, the coke bottle was immediately restored to its original shape, which indicates that the air occupies space. Then release your finger and blow the balloon with your mouth against the glass nozzle. The balloon can easily inflate. At the same time, the small circle from the rubber plug