Why do dewdrops form? How is dew formed?

Li Shizhen said: Dew is liquid water accumulated in Yin Qi, and it is humid night air, which permeates everything on the roadside. So what is the cause of dew formation? I have sorted out the causes of dew formation here for your reference. I hope you get something from reading!

Introduce the reason of dew condensation. Dew can only be formed under the weather conditions of stable atmosphere, small wind, clear sky and local cloudy ground heat loss. If there are clouds in the sky at night, the ground is like a quilt. After the heat hits the clouds, part of it turns back to the ground and the other part is absorbed by the clouds. This part of the heat absorbed by the clouds will slowly radiate to the ground in the later stage, and it is difficult for the ground temperature to drop and dew to appear. If the wind is strong at night, the wind makes the upper and lower air communicate, which increases the temperature of the air near the ground and makes the water vapor diffuse, so it is difficult to form dew.

In the early morning of warm season, the dew that people often see on the grass, leaves and crops on the roadside does not fall from the sky. The reason and process of condensation are the same as frost, except that the temperature is 0? Just above c 0? Above c, the temperature at which air is saturated with water vapor due to cooling is called "dew point temperature". In warm seasons, when the ground objects are cooled by intense radiation at night, the temperature of the air in contact with the surface of the objects drops, and after it drops to the "dew point", excess water vapor is precipitated. Because the temperature is 0 at this time? Above c, these excess water vapor condenses into water droplets and adheres to ground objects, which is dew.

Dewdrops are actually formed when water vapor at the bottom of the atmosphere meets cold air or cold objects. On a clear night, the ground radiation is not protected by clouds, so it dissipates quickly. As soon as the temperature drops, the ability of the air near the ground to contain water vapor decreases, and the water vapor at the bottom of the atmosphere adheres to the grass and leaves one after another, forming water droplets. On cloudy nights, most of the ground radiation is reflected by clouds, and the temperature loss is very small. Like the principle of covering the quilt to keep warm, it is difficult to form dew. Therefore, the formation condition of dew is cloudless night, which means that the morning when dew appears will be sunny.

The principle of keeping in good health through the Millennium solar terms is 1. Add clothes in time in the morning and evening.

Autumn night in a thousand years, a cold night? , Chinese medicine? White dew is not exposed, cold dew is not exposed? In other words, once the Millennium solar term is over, you can't go shirtless when you wear clothes. In addition, the weather is changeable after the Millennium, especially the large temperature difference between morning and evening, which is easy to induce colds or lead to the recurrence of old diseases. If you are gluttonous and afraid of cold at this time, it is easier to make the spleen and stomach function abnormal and damage the yang of the spleen and stomach, especially those with spleen and stomach deficiency and cold should avoid eating.

2, pay attention to nutrition, moistening the lungs and moistening dryness.

Millennium is the solar term with the largest temperature difference between day and night throughout the year. After the Millennium, the temperature began to drop, the weather turned cold and the water vapor condensation on the ground began to increase. After the Millennium, people are prone to dry mouth, dry lips, dry throat, dry skin and other symptoms, which is more typical? Autumn dryness? . The diet in the Millennium season should be based on invigorating the spleen and moistening dryness, and should eat things that are flat, sweet and warm, and should eat nutritious and digestible food. We should not eat too full, so as not to increase the burden on our stomach and lead to gastrointestinal diseases.

Don't be greedy when sleeping at night.

Millennium is a solar term, indicating that the weather is getting cold. Although the temperature can still reach more than 30 degrees during the day, it will still be cold at night, and the temperature difference between day and night is large. If it rains, the temperature will drop more obviously. Therefore, we should pay attention to adding clothes and quilts in the morning and evening, and we should not be topless and show our breasts, nor should we be greedy when sleeping. You have to remind me sooner or later if you don't show your face for a thousand years? That's why.