Why is it snowing in first frost?

The first frost, one of the 24 solar terms, is around 65438+1October 23rd every year. The first frost solar term means that the weather is getting colder and the first frost appears. This is the last solar term in autumn and also means the beginning of winter. If traced back to the source, the water vapor forming frost is suspended in the air near the ground. When the temperature drops and the water vapor is cold saturated, the particles will increase, and there will be a downward trend due to gravity. Its "phase transition" from gas to solid is formed after its gravity sinks and the temperature continues to decrease. In this way, the theory of "first frost" is understandable. We don't have to blame the perfection of the ancients. The theory of the first frost of the 24 solar terms still makes sense.

Snow can be traced back to ancient times. Refers to the process of snow falling to the ground and describes the lightness of snow. At the same time, the weight of snowflakes is very light, and the falling speed is also very slow. Ancient literati generally used it to describe waiting for someone and caring for someone.

I hope I can help you.