It is interesting to know
Such a question can even surprise. What’s so complicated here? After all, the ice icicles that appear on the roofs are ordinary frozen water. But that’s not all. The fact is that icicles only fall from the roof during thaws, and they form and grow at minus temperatures. According to all the laws of physics, water cannot form icicles under such conditions. So where does it come from? The reasons for the appearance of water, the “building material” for the future icicle, may be different. For example, a layer of snow on the roof can be heated from below, from the side of a warm attic. The snow melts slightly, and thin streams of water run down to the eaves. Here they fall into the frosty air, freeze and become icicles. Another reason is possible. On the southern slope of the roof, snow melts under direct sunlight even in light frost. But if the streams of water fall into the shade, they turn into ice. In both cases, since there is a constant “feeding”, the icicles gradually grow. Sometimes they reach impressive sizes. But here comes the thaw, when everything begins to melt. At the point of the icicle, where it is attached to the roof, the ice needle freezes especially strongly. the effect of hot air is added to the roof heated by the sun. At some point, the icicles break under their own weight and fall down. For passers-by, falling ice needles represent a considerable danger. That’s why it’s worth reminding one more time. At the beginning of spring, special caution must be observed. don’t come close to home and look up more often.