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新编初中二年级物理教材“大气压”一节中,有一个演示大气压作用的小实验:一个略大于瓶口的去皮鸡蛋在瓶内外气体压差作用下落入瓶内,这个实验学生有条件自己作,但取出鸡蛋较困难,略作启发,学生可以想到,利用惯性取出,但易损坏鸡蛋. 我们改用吸滤瓶,可用两用气筒抽气或加压,使去皮鸡蛋落入或取出,如图1,并可控制抽打气程度改变鸡蛋落入或取出的速度,以便边讲述边演示.
In the new textbook for atmospheric pressure in the second grade physics textbook for junior middle school students, there is a small experiment demonstrating the role of atmospheric pressure: a peeled egg slightly larger than the bottle’s mouth drops into the bottle under the pressure difference between the inside and outside of the bottle. This experiment student has the condition himself. It’s difficult to make out eggs, but it’s a little inspiration. Students can think of using inertia to remove them, but it’s easy to damage eggs. We use suction filter bottles, which can be pumped or pressurized with dual-use gas cylinders, so that the peeled eggs can fall into or out. , as shown in Figure 1, and can control the degree of pumping gas to change the speed of falling or falling eggs, in order to demonstrate while demonstrating.