Artificial snow fell quietly in a residential building in Shanxi. Do you know the principle of artificial snow?

After water enters the snow maker, it is atomized, and then the atomized water is blown out of the machine by a fan with compressed air, which crystallizes in the process of convection with air, and then naturally settles to the ground to form snow (small particle ice). ?

1, requested by Fu Na.

In the process of making snow, four conditions, namely air temperature, humidity, wind power and water temperature, will affect the progress of making snow. Among them, temperature and humidity play a major role. Generally speaking, when the outdoor temperature is lower than 3℃, it is easy to form the icing process of artificial snowfall; If the temperature is between 0℃ and -2℃, the air must be dry and the humidity should be below 20%, otherwise it is difficult to make snow successfully. ?

2. The difference between artificial snowfall and natural snowfall in Fu Na.

Natural snowfall is that water molecules in the air rise into the air, which is actually the same as the process of forming rain before. However, due to the low temperature in winter, these water molecules do not form rain after simply combining to form water particles, but crystallize to form snowflakes, and finally float to the ground to form a natural snow layer. Through their snow-making principle, we will find that the principle of Fu Na machine and natural snowfall is basically the same, except that one is that natural water vapor supplies water particles, and the other is that high-pressure water pump supplies water particles. However, the reality is that we must build ski resorts quickly, and natural snowfall is obviously too slow. In contrast, it is more practical and feasible to make snow efficiently at the top of the snow machine, and we can quickly make snowflakes with the required thickness on a fixed ski slope. ?

3. The application of Fu Na.

Examples of making snowflakes have appeared in the world for a long time. As early as 1980 in the 13th Winter Olympics, the United States had successfully operated funa to lay ski trails. The classic cases of modern funa are: National Stadium at the end of 2009? The Bird's Nest has become the largest ski resort in Beijing. Because the Bird's Nest is an outdoor venue, restricted by the weather and climate, winter has become the off-season of the Bird's Nest tourism and operation. In order to make better use of the Bird's Nest, after repeated discussions and cooperation, Fu Na finally decided. During the activity, the total amount of snow-making water will reach 25,000 tons. The thickness of snow is about 30 cm to 40 cm. In some places, the thickness of snow will reach 1 m for recreation.

Finally, talk about the shortcomings of funa. Zhao Shiwei, deputy director of Beijing Botanical Garden and doctor of landscape architecture, said that the construction of Fu Na will destroy the soil and affect the living environment of vegetation. When tourists trample on the ski resort, soil hardening may be formed, which will affect the growth of plants in the ski resort after the snow season, and soil erosion is prone to occur in places with large slopes. ?