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中学物理教材对“气体压强的微观解释”都是以“雨滴打在雨伞上”为例阐述的,目前在几种版本的物理选修模块中都介绍了用豆粒(或滚珠)撞击电子秤来模拟气体压强产生机理的实验.然而在教学实践中,笔者发现该实验有一些不足之处.其一是豆粒和小滚珠的释放量不易控制;其二是显示压力的器材较难配置和使用.如果使用电子秤,因其太灵敏,数字的闪烁变化很难观察;如果使用带指针的盘秤,由于称盘面积较大,在豆粒落到秤盘上后,豆粒滞留在盘面上对盘秤称量的干扰无法消除.因而采用这
The physics textbooks for secondary schools are all based on the example of “Raindrops on an Umbrella” as examples of microscopic explanations of gas pressure. At present, in several versions of the physics elective module, the impact of bean grains (or balls) is introduced Electronic scale to simulate the experiment of gas pressure generation mechanism.However, in teaching practice, I found that the experiment has some deficiencies.One is the release of beans and small balls is not easy to control; the second is to show the pressure of the equipment more difficult to configure And use .If using electronic scales, because of its too sensitive, the number of changes in the flicker is difficult to observe; if using a scale with a pointer, due to the weighing plate larger, bean drop in the pan after the bean stuck in the disk Weighing interference with the scale can not be eliminated