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一观察结冰的现象在冬季,观察和研究结冰的现象,是简便而有趣的事情。我们可以选择一个天气良好的夜晚,用两个容器,一个装入淡水,另一个装入盐水,放在屋子外面。第二天早晨便可看见,淡水已经结冰,盐水有时并不冻结。这是因为淡水和盐水两者的冰点(凝固点)温度不同的关系。淡水在零度时冻结;但盐水却要看它所含盐分的多少而定。譬如所含盐分和海水相同,那麽就要到摄氏零下二·五度才冻结。水里溶
An observation of the phenomenon of icing In the winter, it is a simple and interesting thing to observe and study the phenomenon of icing. We can choose a good weather night with two containers, one filled with fresh water and the other filled with salt water, placed outside the house. The next morning it can be seen that the fresh water has been frozen and the salt water sometimes does not freeze. This is because of the different freezing point (freezing point) temperatures of both fresh water and salt water. Freshwater freezes at zero degrees; but salt water depends on the amount of salt it contains. For example, if the salt content is the same as seawater, then it must be frozen at minus two to five degrees Celsius. Water soluble