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在人教版小学自然第七册《物体的热胀冷缩(一)》一课中,有一个“水有热胀冷缩的性质”实验:“在烧瓶内装满染红的水,用中间有细玻璃管的胶管塞紧瓶口,红水会升到细玻璃管中,在液面处做一个记号,将上面的装置放入热水中,看到什么现象?再将上面的装置放入冷水中,看到什么现象?《教学用书》中讲:“通过实验可以看到装有水的烧瓶放入热水中,细玻璃管中的水柱上升,放入冷水中,细玻璃管水柱下降。说明水有热冷缩的性质”。然而,我在上这节课前,按照课本上的实验方法
In the PEP Edition of Natural Science Volume 7 “object of thermal expansion and contraction (a)” class, there is a “water has the nature of expansion and contraction” experiment: “in the flask filled with red water, with The middle of a thin glass tube hose tight bottle, red water will rise to thin glass tube, make a mark at the liquid surface, the above device into the hot water, see what phenomenon? Then the above device Into the cold water, see what phenomenon? ”Teaching Book“ said: ”Through the experiment you can see the flask filled with water into hot water, fine glass tube water column rises, into cold water, thin glass tube Water column down. Explain the nature of water with thermal contraction. "However, before I took this class, according to the textbook on the experimental method