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统编高中物理第一册“自由落体运动”一节,介绍了两个演示实验。第一个演示,可以找一根坏了的日光灯管,保留一端不动,将另一端细心敲开(注意毒气),然后把管的内壁洗净,就成了一根透明的粗玻璃管。把一个一分的人民币和一片鸡毛放进管内,再把单通管玻璃阀的一端插进橡皮塞内,另一端套上橡皮管与抽气机相连,再把橡皮塞塞进管内,四周用凡士林封闭完好,这样就可以进行演示了。
Compile the first volume of high school physics “Freefall Movement” section, introduced two demonstration experiments. The first demo, you can find a broken fluorescent tube, keep one end of the move, carefully knock the other end (pay attention to gas), and then wash the inner wall of the tube, became a transparent coarse glass tube. Put a cent of RMB and a piece of chicken feathers into the tube, and then put one end of the single-pass glass valve into the rubber stopper, the other end of the rubber hose attached to the suction machine connected, and then rubber stopper into the tube, surrounded by Vaseline closed well, so that you can demonstrate.