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同学们,在雪后寒冷的冬天,你看到过房檐下垂下来的冰柱吗?美国作家金·斯坦利·鲁宾逊写过一部《冰柱之谜》的环保科幻小说,是为了警示人们应该重视生态保护和环境建设。那么在现实生活中,你知道冰柱是在怎样的气温下形成的吗?是在温度很低的时候还是在能使雪熔化的温度下产生的呢?大家都知道,雪的熔点和水的凝固点都是0℃。如果高于0℃,水结不了冰;如果低于0℃,雪化不了,也就没有水流下来形成冰柱。这样看来,要想形成冰柱应该有两种温度:一种是
Have you seen the icicles that the eaves hang down in the cold winter months after the snow? US writer Kim Stanley Robinson wrote an environmental science fiction novel “The Mystery of Icicles” to warn People should attach importance to ecological protection and environmental construction. So, in real life, do you know at what temperature the icicles are formed, at low temperatures or at temperatures that melt snow? As we all know, the melting point of snow and water Freezing point is 0 ℃. If higher than 0 ℃, the water can not ice; if less than 0 ℃, snow can not, there is no water flow down to form an icicle. In this way, there are two types of temperatures that you can expect to form an icicle: one is