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本刊在1991年第12期《利用气球做初中物理实验四例》一文中,有一个内容是“演示空气有质量”,读后颇受启发,文中讲的是用“硬质气球”做实验,本人由此想到,如用普通玩具气球做实验,会有什么结果?本人就这个问题作了一些分析并进行了实验。容易理解,普通气球充气后体积胀大很多,浮力的因素不能不考虑,但浮力究竟能有多大的影响,我做了如下的实验。实验所用天平为感量等于0.02克的物理天平,其步骤如下: 1、取一新气球,对它充气之后,用夹子夹紧气球口,放在天平上,调节天平使其平衡,这时读数为m_1=61.26克。 2、测气球的周长,将充入空气的气球近似看作球体
In the 12th issue of “Using Balloons to Do Junior Physics Experiments in 4 Cases” in 1991, this article contained one content “Demonstrating the quality of air”. After reading it, it was quite inspired. In the article, we use “hard balloon” as an experiment. Therefore, I thought that what would be the result of using an ordinary toy balloon as an experiment? I have done some analysis and conducted experiments on this issue. It is easy to understand that the volume inflation of an ordinary balloon is much larger, and the buoyancy factor cannot be ignored. However, how much influence the buoyancy can have, I have done the following experiments. The balance used in the experiment is a physical balance with a sensation equal to 0.02 g. The steps are as follows: 1. Take a new balloon and inflate it. Close the balloon with a clip and place it on the balance. Adjust the balance to make it balanced. It is m_1 = 61.26 g. 2. Measure the perimeter of the balloon and approximate the air-filled balloon as a sphere