In recent days, my country has been affected by the cold wave from Mongolia to Siberia, and the north and south have generally cooled and snowed. Many areas have been affected by the disaster, affecting travel, production and life. In some places, which were not affected by the disaster, the temperature dropped rapidly, and there was a winter snow scene.
Looking at the snowflakes flying in the sky, have you ever thought about how snowflakes are formed?
We pay attention to the sky and often see a lot of clouds floating in the sky, clouds are water vapor in the atmosphere during the rise of cold liquefied into small water droplets or condensed into small Xiaoice crystals, they are mixed to form a visible polymer floating in the air. There are many types of clouds, and there is a type of cloud called hybrid clouds, which contain a large number of small water droplets and Xiaoice crystals. This mixed cloud, when it says it is saturated with ice crystals, it is not yet saturated with water droplets. At this time, the water vapor in the cloud condenses on the surface of the ice crystals, while the water droplets (in a supercooled state) evaporate, and ice crystals are produced from the water droplets"Adsorption"The phenomenon of water vapour. In this case, the ice crystals grow quickly. In addition, a water droplet in a supercooled state is very unstable, and when you touch it, it will freeze. Therefore, in a hybrid cloud, when supercooled water droplets collide with ice crystals, they freeze and stick to the surface of the ice crystals, causing them to grow rapidly. When the Xiaoice crystals grow large enough to overcome the resistance and buoyancy of the air, they fall to the ground, which is called snowflakes.
To put it bluntly, it is the water vapor in the clouds that falls in the form of solid water, forming snowfall.
There are many shapes of snowflakes, the appearance is basically hexagonal, and its various patterns are like exquisite works of art, and there are about 20,000 kinds of snowflake patterns. If you put the snowflakes under a magnifying glass, you will see that each snowflake is a beautiful pattern, and none of them are exactly the same shape as the other.
The size of the snowflakes has a lot to do with the temperature, and the "goose feather snow" is a product of the temperature approaching about 0 degrees Celsius, and is not a symbol of a cold climate. Like this cold wave disaster, many places have dropped sharply, and the snowflake crystals formed under very cold weather conditions are very small, almost invisible to the naked eye, and only when they flicker in the sun, people can find them like fine powder, this kind of snow is called dry snow, to put it simply, it is like someone standing in the sky and sprinkling salt!
The larger the snowflakes, the higher the temperature at that time. At temperatures ranging from -3 to 0, snowflakes are the largest and most complete. Even under such meteorological conditions, the diameter of a single snowflake crystal falling from the sky is usually 05 to 3 millimeters, about the thickness of two five-cent coins, visually not too big.
The so-called goose feather snow is not actually a single snowflake, but is formed by many snowflakes sticking together. Snowflakes descend from the clouds to the ground, the road is very long, and multiple snowflakes can easily climb and merge with each other, and this kind of large snow flakes formed by many snowflakes sticking together, or even merging many times, are exaggerated to say that they look like the feathers of a goose. The largest of the large snow flakes formed by the merger of many times can reach about 15 mm in diameter, which is about the length of an average knuckle.
Li Bai, a great poet of the Tang Dynasty, said, "The snowflakes of Yanshan are as big as a seat, and pieces of them blow down Xuanyuan Terrace." The snowflakes of Yanshan are big, like bamboo mats, and they are scattered piecemeal and fall on the Xuanyuan platform. Picturesque, isn't that a beautiful spectacle?
Winter scenery is rare, so why not put down your work and have fun outdoors to get snow!