Why is it easy to fog in winter?

1, the lower the temperature, the lower the water vapor saturation. For example, 1 m3 air, the maximum water vapor capacity is 6.36g at 4℃; When the temperature is 20℃, the maximum water vapor content in 1 m3 air is17.30g.

2. If the air contains more water vapor than the saturated water vapor at a certain temperature, the excess water vapor will condense. When enough water molecules combine with tiny dust particles in the air, the water molecules themselves will also combine with each other and become small water droplets or ice crystals, forming fog.

3. In winter, the temperature is low, and the water vapor in the air condenses into water droplets when it exceeds saturation, which is mainly caused by the temperature drop. This is why it is foggy in autumn and winter morning.

Extended data:

How to solve the fogging of driving windows in winter?

1, the simplest way-open the window to let the air circulate inside and outside the car.

Window ventilation and convection in the interior and exterior space of the car can alleviate the phenomenon of glass fogging. The advantage of this method is that it can alleviate the fogging phenomenon of windows without any tools, but this method can not be used in all situations, such as when it rains.

2, the most practical way-blow with the air conditioning system that comes with the car.

Winter and rainy days are the high incidence of window fogging. I believe many car owners will use their own air conditioners to remove fog, but the debate about whether it is better to use cold air or warm air to remove fog seems to have never stopped.

The most common way to fog the windshield in rainy days is to turn on the air conditioner and blow the windshield directly. In this way, when the cold wind blows on the glass, the fog will soon disperse, and the effect will be quick and direct. This is because cold air blows on the glass, forming a "cold film" on the surface of the glass, preventing carbon dioxide from condensing on the glass and playing the role of defogging.

Public trust. Com- car use skills: give you advice to solve the problem of fogging in winter driving windows.