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一、大气压强作用的假设历来的教材中,覆杯实验在物理教学中都被用来验证大气压的存在.取一个玻璃杯,往杯子里面灌满水,再取一张比杯口略大些的不渗水的硬纸片(或塑料片、玻璃片)盖于杯口,用手按住硬纸片,将玻璃杯缓慢倒置后,放开按住硬纸片的手,水竟然不落下来.是什么力量把硬纸片和水托住了呢?仅是由于大气压的作用吗?如果仅是由于大气压强的作用,那么硬纸片上最多可以挂多重的物体呢?对于一个口径为
First, atmospheric pressure assumptions The textbook, the overlying cup experiment in physics teaching have been used to verify the existence of atmospheric pressure. Take a glass, cup filled with water, and then take a cup slightly larger than the cup Of water impermeable cardboard (or plastic sheet, glass) cover the cup mouth, hold the cardboard by hand, the glass slowly inverted, release hold the cardboard hand, the water does not even fall down What forces hold the cardboard and water up? Is it just because of atmospheric pressure? If only because of the action of atmospheric pressure, then the maximum number of pieces of cardboard can be hung on it? For a caliber