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验证玻意耳一马略特定律是高中物理必做的学生实验之一,也是唯一的一个热学实验.该实验虽然比较简单,但我们认为还有几个问题值得探讨. 1.用弹簧秤拉活塞的操作欠妥. 验证玻一马定律时,让气体膨胀,高中物理教材上讲:“取下挂在框架上的钧码,用弹簧秤钩住框架上的钩竖直向上拉,使空气柱的体积增大,由于活塞所受到的拉力跟活塞和框架所受的重力方向相反,它们的合力应是拉力和重力之差,记下每拉到一定高度时弹簧秤的读数,算出加在空气柱上的合力F的数值,记下相应空气柱的体积,”从表面上看没有什么不妥,但照教材的叙述,实际去做一做便会发现:读数的时
The verification of the Boyle-Marxism law is one of the must-do students’ experiments in high school physics, and is the only thermal experiment. Although the experiment is relatively simple, we think there are still several issues worth exploring. 1. Pull the piston with a spring balance The operation is defective. When verifying the law of glass, let the gas swell and the high school physics textbook says: “Remove the weight hanging from the frame, and hook the spring hook on the frame to pull up vertically and make the air column’s As the volume increases, the resultant force of the piston is opposite to the direction of gravity of the piston and frame. Their resultant force should be the difference between tension and gravity. Record the reading of the spring scale each time it is pulled to a certain height and calculate it on the air column. The value of the resultant force F, note the volume of the corresponding air column, ”There is nothing wrong with the surface, but according to the description of the textbook, actually do it once and you will find: when reading