测定空气的质量对建立空气密度的概念和大气压强的产生起着至关重要的作用，对激发初二学生学习物理的兴趣也是很有益处的。原教材是采用抽气筒对盛有一定空气的玻璃球壳抽空气，用天平称量抽气前后玻璃球壳的质量，玻璃球壳减少的质量即为抽出的空气的质量。但此实验有不足之 The determination of air quality plays a crucial role in establishing the concept of air density and the generation of atmospheric pressure. It is also beneficial to stimulate the physics interest of students in grade two. The original textbook used a suction tube to pump air to a glass sphere containing a certain amount of air. The mass of the glass sphere before and after the pumping was weighed using a balance. The reduced mass of the glass sphere was the quality of the extracted air. However, this experiment has insufficient