Traditional Culture Encyclopedia - Weather inquiry - How to solve the fog in the car in rainy days

How to solve the fog in the car in rainy days

The fog inside the car is because the humidity inside the car is relatively high. The following solutions are available.

1, window convection: If it is found that the fog inside the car is not big, you can open a gap in the windows on both sides, so that the air inside and outside the car will form convection, the temperature difference will be reduced, and the fog will gradually disappear.

The principle of this method is the same as turning on the air conditioner, but it does not increase fuel consumption. The disadvantage of window convection is very obvious, which is not available in rainy and snowy weather, expressway and foggy weather. Opening the window will reduce the temperature inside the car.

2. Air conditioning system: For most car owners, using air conditioning system for fog removal is the most common. At present, almost all cars on the market have air conditioning outlets under the front windshield. Just select the air conditioner to the corresponding gear and use the air blown by the air conditioner to demist.

But cold air or warm air? Cold/warm air has its advantages and disadvantages. If you are in a hurry, you can use cold air for emergency. In most cases, warm air is still recommended.

Extended data

Car fogging is actually a simple physical phenomenon. Generally, people think that it is caused by "large temperature difference between internal heat and external cold", which is only macroscopic water vapor liquefaction and microscopic related to saturated air pressure.

It shows that when the outside temperature is high, the water vapor saturation pressure is high, and when the glass temperature is low, the water vapor saturation pressure decreases near the glass. When the temperature difference is large enough and the saturation pressure is low enough, water will liquefy. The closer to the glass water, the lower the saturated air pressure, and the easier it is for water to liquefy.