中学物理课中,讲到原子物理部分时,常用威尔逊云雾室观察放射线粒子的运动径迹。在实验中为使云雾室中充满饱和的酒精蒸汽,一般是用滴管把40％水和60％的酒精混合物均匀地滴在云雾室内的呢子上。当实验室温度较低,仪器不够密封时,蒸汽不易达到饱和,如果在配好的水与酒精混合物中 In the middle school physics class, when the part of atomic physics was mentioned, the Wilson Cloud Chamber was used to observe the movement of radioactive particles. In experiments, in order to fill the cloud chamber with saturated alcohol vapor, it is common to use a pipette to uniformly mix 40% water and 60% alcohol on the woolen cloth inside the cloud chamber. When the temperature in the laboratory is low and the instrument is not sufficiently sealed, steam does not saturate easily if it is in a mixture of water and alcohol.