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有一天,我想从暖瓶里倒出一些水来,可是怎么也拔不出暖瓶塞。我问妈妈:“为什么我怎么也拔不出暖瓶塞呢?”妈妈说:“因为随着暖瓶内壁的温度下降,暖瓶内的水蒸气遇到较冷的瓶壁,要液化成小水滴顺瓶壁流下,与水混合。这样一来,暖瓶内的压强变小,小于外界的大气压强,外界的大气压强就把瓶塞紧紧地压在了瓶口处,所以会出现难以拔出瓶塞的现象。你把瓶塞左右晃一晃,让外面的空气进去一些,就可以拔出来了。”我按妈妈说的去做,果然把瓶塞拔出来了。
One day, I would like to pour some water out of the thermos bottle, but how can I not pull out the thermos bottle? I asked my mom: “Why I can not pull out the thermos cork?” “Mom said: ” Because as the temperature of the inner wall of the thermos drops, the water vapor in the thermos meets the cold bottle wall and liquefies into Small droplets along the bottle wall flow, mixed with water.Thus, the pressure inside the thermos flask becomes smaller, less than the outside atmospheric pressure, the atmospheric pressure outside the bottle stopper tightly pressed at the bottleneck, it will appear difficult Pull out the cork phenomenon.You shake the stopper around, let the outside air into some, you can pull out. "I press my mom to do, and really pulled out the cork.