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一、有利于放大细微的实验现象。便于学生观察演示实验的主要功能是建立概念,总结规律,验证规律,在物理演示实验中需要观察物理现象的动态变化过程和变化效应。然而有些现象变化效应微弱或能见度低,学生难以观察或观察不清,由于投影仪具有放大功能,又具有改变光路的特点,可以解决以上困难,优化演示实验。在“内能”这节教学中要演示温度与扩散
First, it is conducive to amplifying subtle experimental phenomena. The main function of facilitating the students to observe the demonstration experiment is to establish the concept, summarize the law, and verify the law. In the physical demonstration experiment, it is necessary to observe the dynamic change process and change effect of the physical phenomenon. However, some phenomenon change effects are weak or visibility is low, and it is difficult for students to observe or observe. Since the projector has an amplification function and has the characteristics of changing the light path, the above difficulties can be solved and the demonstration experiment can be optimized. Demonstrate temperature and diffusion in the teaching of “internal energy”