What Causes Fogging on the Outside of Car Windows?
1 Answers
Fogging on the outside of the car's front windshield is caused by the temperature difference between the inside and outside of the vehicle. When the temperature inside the cabin is lower than the outside, moisture from the exterior condenses on the windshield, forming fog. This phenomenon is most common in winter. Here are specific methods to solve fogging on the outside of car windshields: 1. Air Conditioning Defogging: This is the simplest method. Just turn on the front window defogging mode, set the fan speed to maximum, turn on the A/C switch, and adjust the temperature to the lowest setting. The fog on the glass will disappear shortly. Additionally, many modern vehicles feature a one-touch defogging function, which can be activated when fogging occurs for quick and convenient results. 2. Airflow Ventilation: This method is suitable in very limited situations. Opening the windows increases airflow, reduces the temperature difference between the inside and outside of the car, and weakens the conditions for fog formation. While this method seems economical, it is rarely practical. For example, if it's raining outside, you can't keep the windows open, and the incoming airflow is also limited. 3. Anti-Fog Spray: Anti-fog sprays on the market range in price from tens to hundreds of yuan, but their ingredients are generally similar, with durability being the main difference. To use, simply spray it evenly on the glass surface and wipe it clean with a dry towel. The principle involves using surfactants to form a protective film on the glass surface, altering the surface tension of water molecules and causing fog droplets to merge into larger droplets, thus preventing obstruction of vision. This method is also suitable for other car windows, especially the side mirrors.
