How does fog form and dissipate?

1, which is formed by radiation cooling, mostly appears at night and early morning. When the weather is clear, the wind is light, the water vapor near the ground is rich and stable or there is inversion, it is called radiation fog in meteorology.

2. Warm and humid air moves horizontally. After passing through the cold ground or water surface, the water vapor in the air is gradually liquefied by cold, which is called advection fog in meteorology.

The smog in the city is caused by another reason, that is, human activities.

Second, dissipation.

1. As the underlying surface gets warmer, the fog drops evaporate.

2. With the increase of wind speed, the fog will dissipate or dissipate into clouds; Then turbulent mixing, water vapor upload, heat transfer, and evaporation of droplets near the ground.

To spread out information and drive safely in foggy days, we must pay attention to six major matters.

1. When driving in fog, you should observe the regulations on the use of lights: turn on fog lights, tail lights, width lights and low beam lights, improve visibility, see clearly the dynamics of vehicles and pedestrians, and avoid rear-end collision or scraping accidents.

2. honk the horn frequently, and the line of sight is not good in foggy days. Frequently honking the horn can warn pedestrians and vehicles, and at the same time indicate the position of your vehicle to avoid collision accidents due to poor visibility.

3. Driving at a low speed in foggy days, even in light foggy areas, should appropriately slow down the driving speed and appropriately increase the driving distance.

4. When driving, you can always brush off the water vapor with a wiper, or turn on the air conditioner or slightly open the window, so as to eliminate or avoid the fogging of the glass.

5. Pull over at the right time. In case of sudden fog, it is too late to enter the nearest service area. You should park your car on the emergency parking belt in expressway as soon as possible, and turn on the fog lights, width indicators and taillights.

6. It is equally important for drivers to listen to all directions in expressway. Once you hear the sound of a car crashing in front of you, you should quickly park your car on the side of the road and turn on all the lights to ensure safety.

Baidu encyclopedia-fog