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1.大气压强的演示初中教材中是用抽成真空的马德堡半球演示的。此方法有时是“半球”与抽气机接口处封闭不严而影响实验效果。用医用注射器代替上述仪器,操作方法简便,且较好封闭。具体方法是(见图1):将注射器竖直固定在铁架台上,用橡皮帽封住注射器细嘴处,再在活塞颈部拴一带环节的细绳,将钩码挂在线环上,即可说明大气压强的作用。
1. Demonstration of Atmospheric Pressure In the junior high school textbooks, demonstrations were performed using the Hetenberg hemisphere that was evacuated. This method is sometimes “hemisphere” and the suction machine at the interface is not strict and affect the experimental results. Replace the instrument with a medical syringe, the method of operation is simple and well closed. The specific method is (see Figure 1): The syringe is fixed vertically on the iron platform, the rubber nozzle is used to seal the fine nozzle of the syringe, and then a thin cord is attached to the neck of the piston, and the hook code is hung on the wire ring. It can explain the effect of atmospheric pressure.