Why can the hot water spilled in the north freeze instantly in winter?

The factors affecting the evaporation rate of liquid are liquid temperature, liquid surface area and air velocity near the liquid surface. The higher the liquid temperature, the larger the surface area, the faster the air flow near the liquid surface and the faster the liquid evaporation. Of course, from the shape point of view, sprinkling water on the fan also increases the surface area of water, which is equivalent to accelerating air flow (water is equivalent to air flow) and accelerating water evaporation. When the surface area of water and air velocity are constant, the higher the temperature of water, the faster the evaporation rate, the more water vapor obtained, the more condensed ice crystals, and the more spectacular the splash of water into ice.

If you use cold water, it will turn into an ice cube when you are ready. The effect of mixing water into ice first requires a low temperature below MINUS 30 degrees, and then the hot water is poured out. These hot water can provide a lot of water vapor. In the process of hot water spraying, floating water vapor will crystallize rapidly in cold water vapor, resulting in the beautiful effect of fog. Therefore, hot water is to provide water vapor, and the outdoor low temperature environment for water vapor crystallization is essential. The external environment temperature, water temperature, diameter of water droplets, viscosity of water and running time of water droplets in cold air affect the specific effect of the experiment of pouring water into ice.

Therefore, in order to achieve the effect of splashing water into ice on the ground, it is necessary to use hot water near 100 degrees, and the ambient temperature should be low enough. If you stand in a very high place and carry out the experiment of splashing water and freezing, the requirements for environmental temperature and water temperature will be greatly reduced. When the temperature of liquid drops, the speed of molecules will slow down. As the molecular speed slows down, the kinetic energy decreases and the attractive force between liquid molecules increases. This attraction in turn makes the liquid more viscous.

In the experiment of pouring water into ice, after pouring out with low-temperature water, large droplets will be formed. Large water droplets cool slowly and are not easy to form ice before landing. In addition, when there is air resistance, water droplets cannot fall freely. The smaller the diameter of a water droplet, the longer it moves in the air and the more fully it is cooled. Outside temperature, pouring water, moving in cold air. The size of the water droplets. As long as the external ambient temperature is below 0 degrees, water will fall from a very high place, run in the air for a long time, be completely cooled in cold air, and freeze into ice before landing, regardless of the water temperature. However, if water freezes in a short time, the third factor, the size of water droplets, is decisive. The water droplets are small enough to have more contact with the surrounding air than the surface area, and the cooling speed is faster.