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初中物理第一册“大气的压强”一节,安排了“水杯盛满水用纸片将杯日盖严倒置水不流出”的演示实验,用以说明大气压强产生托力,托住纸片使水不流出。此实验可就地取材又富有兴味。但往往因纸片封盖不严,而致杯内进入空气,使水倾杯而出。为了做好这实验,我将此实验装置在杯口、杯底做了一点改进(见图1—5),现介绍如下: 推车内胎,8—10厘米即可,找一个杯口直径比所选车胎直径稍大的杯子(如玻璃杯塑料杯或瓶类均可)。将内胎直径张大,如
In the “Volume of Atmosphere” section of the first volume of junior high school physics, a demonstration experiment was set up to describe the “water cup filled with paper for water to cover the glass and cover the water without flowing out”. Do not let water flow out. This experiment can be applied locally and is interesting. However, due to the fact that the paper sheets are not tightly closed, the inside of the cup is allowed to enter the air and the water is poured out. In order to do this experiment, I did a bit of improvement on the cup and the bottom of the cup (see Figure 1-5). Now we introduce the following: The inner tube of the stroller can be 8-10 cm. The cup with a slightly larger diameter is selected (such as a glass plastic cup or bottle). The inner diameter of the inner tube is enlarged, such as