按書作現象不够明顯,因为石灰水粘在上面的不多,混濁時看不清,我們是用乾而清潔的集气瓶代替它。首先看到的是瓶壁上生成水蒸气,然後用磨玻璃盖着拿下來,往瓶里倒石灰水,搖盪,現象非常明顯。 (見初中化学課本1955年4月版第126页) According to the phenomenon of the book is not obvious enough, because the lime water sticks to the top not much, muddy unclear, we are replaced with a dry and clean gas cylinder instead. The first thing you see is the generation of water vapor on the wall of the bottle, and then covered with ground glass, pouring lime water into the bottle and shaking it. The phenomenon is very obvious. (See junior high school chemistry text April 1955 page 126)