Why Does the Inside of Car Windows Fog Up After Rain?
2 Answers
The reason for fog on the inside of car windows after rain: When it rains, the temperature is lower, and the heat inside the car contains a large number of water molecules. When warm air hits the cold windshield, it condenses into fog. Methods to remove fog: 1. Turn on the heater and increase the fan speed slightly to prevent fog from forming on the windows; 2. If the rain is not heavy, you can simply open the windows for a few seconds to clear the fog; 3. Turn on the car's defroster to remove the fog. In emergencies, opening the window is a very effective method, and the effect is quick. After all, the fog on the front windshield is caused by the high temperature and humidity inside the car. As long as the interior can be dried and cooled, the formation of fog can be suppressed.
I've been driving for many years, and fogging on the windows after rain is quite common, mainly due to the imbalance in humidity inside and outside the car during rainy weather. Wet items like rain gear or damp clothes brought in from outside increase the moisture inside the car, while the cooler temperature of the windows, combined with the cooling effect of rainwater, causes internal moisture to condense on the surface, forming a layer of fog. Similar situations often occur in cold weather or after washing the car. If not addressed promptly, the fog can obstruct visibility and increase driving risks. From my experience, it's best to turn on the defroster function of the air conditioning or slightly open the windows for ventilation as soon as you get in the car to allow air circulation and reduce moisture buildup. When parking, try to dry your umbrella to avoid high humidity inside the car. These small habits can significantly reduce fogging issues.
