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1.取一只空瓶,瓶口较大的好一些.向空瓶中投入一块燃烧的纸团,迅速取一块气球皮,在瓶口绷紧.一会儿,火灭了.再稍待一会儿,气球皮就迅速陷入瓶颈之中了.如果用针把气球皮刺破,便会产生很大的声音.学生的视觉和听觉器官都感受到实验带来的信息刺激,印象深刻,兴致高涨.且本装置可当即重复实验,无需费力取出瓶中物体(图1).2.取两只同样的广口瓶,在一只空瓶中点燃一只蜡烛头,在瓶口盖上一张浸湿的吸水纸.然后,把另一只空瓶倒放在上面.几秒钟后,烛
1. Take an empty bottle and the bottle is larger. Put a piece of burning paper into the empty bottle and quickly take a piece of balloon skin. Tighten it at the bottle mouth. After a while, the fire is gone. Wait a little longer, The balloon skin quickly falls into the bottleneck. If the balloon skin is punctured with a needle, it will produce a loud voice. The students’ visual and auditory organs will feel the information stimulated by the experiment, and they will be impressed and excited. The device can immediately repeat the experiment, without effort to remove the bottle of objects (Figure 1). 2. Take the same two-mouthed jar, light a candle in an empty bottle, soaked in a bottle cap The absorbent paper. Then, put another empty bottle upside down. After a few seconds, the candle