Why does snow fall from a high place and fall on the snow in an approximately circular shape?

Haha....Let's talk about the itinerary of the snowflakes first...I guess there are very few snowflakes in the garden....Xiaoice is changed by the enlargement of small ice crystals, and the ice molecules are hexagonal for the most, so the formation of snowflakes is mostly hexagonal. The variety of snowflake shapes is closely related to the water vapor conditions at the time of its formation. For hexagonal flake ice crystals, due to the different degrees of curvature on their surfaces, edges and corners, they correspondingly have different saturated water vapor pressures, among which the saturated water vapor pressure on the corners is the largest, followed by the edges, and the smallest on the plane.

In the case of the same water vapor pressure, the condensation growth of ice crystals is also different due to the different saturated water vapor pressures on the surface, edges and corners of ice crystals. If the water vapor in the cloud is not very abundant, the actual water vapor pressure is only greater than the saturated water vapor pressure of the plane, and the water vapor only condenses on the surface, and the formation is a columnar snowflake; If there is a little more water vapor, the actual water vapor pressure is greater than the saturated water vapor pressure on the edge, and the water vapor will condense on the edge and on the surface, because the speed of condensation is also related to the degree of bending, the condensation is faster in places with a large degree of bending, so the condensation on the edge of the ice crystal is faster than that on the surface, and more flakes are formed at this time; If the water vapor in the cloud is very abundant, the actual water vapor pressure is greater than the saturated water vapor pressure on the corner, so that there are water vapor condensation on the surface, edge, and corner, but the position of the sharp corner is prominent, the water vapor ** is the most sufficient, and the condensation grows the fastest, so it forms more branch-like or stellate snowflakes. In addition, the constant movement of ice crystals and the changing temperature and humidity conditions in which they are exposed to ice crystals result in the various parts of the ice crystals growing at different rates, resulting in a variety of snowflakes.

It is subjected to equal forces in all directions.

Snowflakes are mostly hexagonal, the reason why there are many patterns, is because the molecules of ice are hexagonal for the most, for hexagonal flake ice crystals, due to the different curvature on its surface, edge and corner, it has different saturated water vapor pressure correspondingly, wherein the saturated water vapor pressure on the corner is the largest, the edge is second, and the plane is the smallest.

In the case of the same water vapor pressure, the condensation growth of ice crystals is also different due to the difference in saturation and water vapor pressure of each part. For example, when the actual water vapor pressure is only greater than the saturated water vapor pressure of the plane, the water vapor only condenses on the surface, forming columnar snowflakes.

When the actual water vapor pressure is greater than the saturated water vapor pressure on the edge, condensation will occur on the edge and on the surface. Because the speed of condensation is also related to the curvature, the condensation is faster in places with large curvature, so the condensation on the edge of the ice crystal is faster than on the surface, and more flakes are formed.

The temperature plus the wind direction, plus the height, so the change is different!