现行高中物理(必修)第一册第六章补充习题7为:“有时在较暗的房间里可以观察到射入屋里的阳光中有悬浮在空气里的小颗粒在飞舞,这是布朗运动吗?为什么?”该道习题一般解释为:这些肉眼所能观察到的颗粒是相当大的,它所受到的各方向空气分子碰撞 The current high school physics (required) in Chapter 6 of Supplementary Exercise 7 is: “Sometimes in a dark room, you can observe that small particles suspended in the air are flying in the sunlight that enters the room. This is the Brownian movement. Why?” The exercise is generally explained as follows: The particles that can be observed by the naked eye are quite large, and the air molecules that they encounter are collided in all directions.