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气体对四壁的压强是由大量无规则运动的气体分子与四壁持续的碰撞结果。气体分子对四壁有一个冲量,大小是:Ft=△mv 这是高中物理课本中对气体压强本质的微观解释。学生在学了冲量的概念后,对一个物体的Ft=△mv是印象很深的,而对大量的气体分子持续地和四壁碰撞所造成的这个效应,不易理解。我设计了一个实验,介绍如下:把托盘天平调节好(选用的是感量为1/10克的,托盘一般是由胶木制的,底部是呈曲率半径很大的弧形的一种)。把右边的托盘翻过来,放在支架
The pressure of the gas on the four walls is a result of the continuous collision of a large number of randomly moving gas molecules with the four walls. Gas molecules have an impulse on the four walls, and the size is: Ft = Δmv This is a microscopic explanation of the nature of gas pressure in high school physics textbooks. After learning the concept of impulse, students are very impressed with an object’s Ft = △mv, and this effect caused by the continuous and four-wall collision of a large number of gas molecules is not easy to understand. I designed an experiment and introduced it as follows: The balance of the tray is well adjusted (selected is a 1/10 gram quantity, the tray is usually made of bakelite, and the bottom is a curved shape with a large radius of curvature) . Turn the right tray over and place it on the stand