The ancients described the scene of light snow season.

The ancients described the scene of the light snow season like this:

1. Describe the temperature and weather: The ancients usually used the words "cold", "cold", "frost" and "freezing" to describe the weather in the light snow season. For example, "light snow is very cold and it will snow, but the ground is not even cold and the snow is not big", which means that the weather is already very cold in the light snow season and it will snow soon. But it hasn't reached the coldest season yet, so it doesn't snow much.

2. Description of scenery and natural phenomena: When the ancients described the scenery in the light snow season, they often used words such as "snowy" and "snowy" to describe it. For example, "there are no birds in a hundred mountains, and there are no footprints in a thousand paths." A boat, a bamboo coat, an old man fishing in a cold river-Snow ",a poem written by Liu Zongyuan, a poet in the Tang Dynasty, in Jiang Xue, depicts a quiet and beautiful snow scene.

3. Describe agricultural production: the light snow season is an important period of agricultural production, and the ancients will also pay attention to agricultural production activities at this time. For example, "it's okay when the light snow accumulates, so check it when it comes." Look at the richness of the forest, and the people have no complaints. "This poem describes the sunny snow in the light snow season, which indicates that the harvest in the coming year will have good results.

Reasons for the formation of light snow

1, meteorological reason: light snow is a weather phenomenon and belongs to a kind of precipitation. It is mainly formed by the crystallization of water vapor in the air into tiny ice crystals or snowflakes at low temperature. When the air temperature gradually decreases, the water vapor in the air will begin to crystallize and form tiny ice crystals or snowflakes. These tiny ice crystals or snowflakes gather together in the air and finally form the light snow we see.

2. Physical reasons: The formation of light snow also involves some principles in physics. Among them, temperature gradient and solidification are the most important. When the air temperature decreases, the saturation pressure of water vapor in the air will also decrease, so that water vapor will begin to condense in the lower temperature area.

3. Climatic conditions: The formation of light snow is also affected by climatic conditions. In a dry climate, there is less water vapor in the air, so it is difficult to form precipitation. In a humid climate, the water vapor content in the air is higher, so it is easier to form precipitation. As the temperature gradually drops, the water vapor in the air begins to condense into tiny ice crystals or snowflakes, forming light snow.

4. Topography and geographical location: The formation of light snow is also related to topography and geographical location. In some areas with complex terrain, such as mountainous areas, due to the influence of terrain, air flow will be hindered, making it easier for water vapor in the air to condense into tiny ice crystals or snowflakes in some areas. In addition, geographical location will also affect the formation of light snow.