What Causes Car Window Fogging on Rainy Days?
2 Answers
On rainy days, car windows fog up due to the temperature difference between the inside and outside of the vehicle. When the interior temperature is higher than the exterior, water molecules in the air inside the car condense into mist upon contact with the colder window surface. Methods to deal with fogged car windows include: 1. Wiping them clean with a towel; 2. Turning on the car's heater to clear the fog; 3. Using the air conditioning's cooling and dehumidifying function to reduce air humidity; 4. Applying anti-fog spray for car windows. Maintenance tips for car windows include: 1. Using appropriate windshield washer fluid according to the season; 2. Applying heat-insulating film to the car windows. The functions of car windows are: 1. Shielding against wind and rain, and reducing noise; 2. Minimizing wind resistance and improving airflow; 3. Protecting the safety of passengers inside the vehicle.
Fogging on car windows during rainy days is mainly caused by the temperature and humidity differences between the inside and outside of the vehicle. External rain makes the window glass very cold, while inside the car, if there is moisture from your breath, wet clothes, or rain brought in, the warm and humid air will condense into water droplets when it meets the cold glass. I often see this situation when repairing cars. The solution is to immediately turn on the air conditioning's defogging mode and set the temperature to the cold air position. The air conditioning will absorb excess moisture, drying the air. Regular maintenance of window cleanliness is also crucial—don't let the inner glass get greasy, as that makes it more prone to fogging. If the fogging is severe, you can briefly open the window slightly for ventilation, but not for too long to prevent rain from entering and affecting safety. After all, visibility is already poor when driving in the rain, and fogging further increases the risk.
