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在初中物理课堂演示实验中,“覆杯实验”应该是最接近学生生活的简易实验之一。“覆杯实验”最直接地证明了大气压强的存在。在大气压的作用下,教师将盖上纸片的满满一杯水倒置过来,整杯水不会流出来。在整个实验过程中,观察的学生屏气凝神,结果也让他们颇感意外。然而,该实验要能在课堂上成功演示也不太容易。笔者探索了很长一段时
In a junior high school physics class demonstration experiment, “cup experiment” should be one of the simple experiments closest to student life. “Cup test ” the most direct proof of the existence of atmospheric pressure. Under the action of atmospheric pressure, the teacher inverts a full cup of water covered with paper and the whole cup of water will not flow out. Throughout the experiment, the students observed breathtaking, the results also make them quite surprised. However, it is not easy to experiment successfully in class. The author explored for a long time