It will clear up after a long period of rain and fog. Why is it sunny after fog?

Everyone must have heard that "it will be cloudy after a long rain", which is a valuable experience summed up by our ancestors. Of course, in ancient times, we didn't know the scientific principle behind it. We just summed up our experience through observation and practice. So today, let's talk about the knowledge behind it.

Fog is mainly small water droplets suspended in the air. Let's talk about how fog is formed.

Fogging is mainly due to the saturation of water vapor in the air, which can not be integrated into the air, and then mixed with fine dust in the air to form water droplets and ice crystals. The higher the temperature, the more water vapor the air absorbs. The lower the air temperature, the less water it can absorb. Just like when we make sugar water, the sugar water is saturated and the sugar particles can't be integrated, but when we heat the sugar water, the sugar particles that just can't be integrated can be integrated into the water. On the contrary, when the boiling sugar water cools slowly, we will find that sugar particles will appear at the bottom of the cup.

Then let's explain the reason why it will be cloudy if it is sunny for a long time. On a normal sunny night, because the weather is dry, there is generally little water vapor in the air, so it is impossible to produce fog in such an environment. This can only show that cold air is coming, which makes the temperature drop, and the cold air itself has water vapor. In addition, as soon as the air is lowered, the water vapor that was originally integrated into the air slowly precipitates out, and the water vapor in the air appears, and the water vapor and the dust in the air merge to form a fog; So "it will be cloudy for a long time" is the truth!

Then why do you say "after the rain clears, after the fog clears"? This happens at night, after the rain, the weather turns fine, the ground humidity is high, the cold air dissipates, and the hot air comes in. In this way, the water on the surface is evaporated into the air, which combines with the dust in the air to form water droplets and ice crystals, thus forming fog in the morning. When the sun comes out, the temperature rises and the fog clears, it is sunny.

These are the crystallization of the wisdom of our ancient working people, and there are many proverbs like "it will be cloudy if it is sunny for a long time, and it will be sunny if it rains for a long time". In ancient times, people did not understand scientific truth, but through observation and accumulation, they discovered this scientific phenomenon and had to admire it.