在中学物理教学中,讲到和应用空气密度的地方很多,可是气体的密度不易测定出来,现在介绍一种用简单的仪器测定空气密度的方法。如图1,一个带开关的塑料桶A,把开关打开,用图1给塑料桶充气平常的打气筒向塑料桶内打气,塑料桶充气到一定的程度,就把开关关上,测其质最。然后,取一个内径为 In middle school physics teaching, there are many places where air density is mentioned and applied, but the density of gas is not easily determined. Now, a method for measuring air density with a simple instrument is introduced. As shown in Figure 1, a plastic bucket with a switch A, the switch is opened, with a plastic pump inflating the usual pump in Figure 1 to inflate the plastic bucket, the plastic bucket is inflated to a certain extent, the switch is closed, the most . Then, take an inner diameter of