前不久下校视导,听初二物理《大气的压强》课,教师组织马德堡半球演示实验的教学,让人感触颇深.首先,教师出示未抽气的演示半球让学生拉,学生不费力便把半球拉开了,接着,教师用抽气机从半球中抽气,然后,再让学生拉,学生 Not long ago, he took a guided tour of the school and listened to the physical “Atmospheric Pressure” lesson in the first two days. The teacher’s organization of the teaching demonstration of the Heidelberg hemisphere demonstration experiment was deeply instructive. First, the teacher showed the unexhausted demonstration hemisphere for students to pull, and the students did not The hemisphere was pulled apart by a laborious effort. Then, the teacher used a suction machine to extract air from the hemisphere. Then, the student was allowed to pull.