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投影仪除能增大投影片的可见度外,也能增大演示实验的可见度,在物理教学中得到巧用.巧用之一:人教版物理第一册第45页有个“压缩体积使气体液体”的演示实验,实验过程:取一支大的注射器,拉动活塞让注射器吸进少许液态乙醚,取下针头,用橡皮帽把注射器小孔堵住后,向外拉活塞到一定程度时,注射器里的液态乙醚消失,全部变为乙醚蒸气,然后推动活塞压缩乙醚蒸气体积,观察到器壁上有液滴出现.
In addition to increasing the visibility of the slide, the projector can also increase the visibility of the demonstration experiment. It can be used cleverly in physics teaching. One of the clever uses: PEP physics volume 1 page 45 has a “compression volume ”Gaseous liquid" demonstration experiment, the experimental process: take a large syringe, pull the piston so that the syringe sucks a little liquid ether, remove the needle, use a rubber cap to plug the syringe hole, pull the piston outward to a certain extent The liquid ether in the syringe disappeared, all became ether vapor, and then the piston was compressed to compress the volume of ether vapor, and the presence of droplets on the wall was observed.