Snow

What is the process of snowfall? To answer that, we can start from the process of snow. Starting from the water vapor that congregates in the Earth's atmosphere, the vapor pool cools to the point of condensation (ie the temperature at which the gas changes shape to liquid or solid), then clumps to form clouds. At the beginning of cloud formation, the mass is much smaller than the air mass so that the cloud floats in the air just like a wooden beam floating on the surface of the water. However, as the vapor pool continues to accumulate and merge into the cloud, its mass also increases, so that at some point the air can no longer hold it. The cloud broke and the water particles fell to Earth. The falling water particles are pure water (not yet contaminated by other particles). Pure water does not freeze directly at 0 degrees Celsius, because at that temperature there is a phase change from liquid to solid. To make the pure water frozen required temperatures lower than 0 degrees Celsius.