一天,我看到书上一个有趣的问题:“空气有重量吗?”我认为空气看不见,摸不着,肯定没有重量。为了弄清这个问题,我按着书上说的做了一次实验。我准备好一条长长的细竹片、一个气球、一根细线、一个小纸筐和一些细沙。在竹片的两头和中间各钻一个小孔,用细线穿过中间的小孔,把竹? One day, I saw an interesting question on the book: “Is the air heavy?” I do not think the air can be seen or touched, and there is certainly no weight. In order to clarify this issue, I made an experiment according to the book said. I have prepared a long thin bamboo, a balloon, a thin line, a small paper basket and some fine sand. Drill a small hole in each of the two ends of the bamboo and in the middle, with a thin line through the small hole in the middle, the bamboo?