Why Does Car Glass Fog Up in Summer?
2 Answers
Here is the relevant explanation: 1. Window fogging: In summer, car window fogging is different from winter fogging. Summer fog mostly occurs on the outside of the windows and usually appears in clusters, meaning the fog forms in patches rather than covering the entire window surface. This is the biggest difference between summer and winter fogging. 2. Car fogging: In summer, car fogging occurs because the air conditioning temperature inside the car is set too low, creating a large temperature difference. Additionally, the direction of the air conditioning airflow is not properly adjusted, such as when the airflow is directed at the front windshield or the side windows. When this cold air blows out, it significantly lowers the temperature of the glass area. When this cold glass comes into contact with the warmer outside air, combined with high humidity, it easily forms a layer of water vapor on the outside.
Fogging on car windows in summer is primarily caused by condensation due to temperature differences. The outside air is hot and humid, containing a large amount of water vapor, while the car's air conditioning is turned on cold, lowering the temperature of the window glass. When the warm, humid outside air comes into contact with the cold glass, the temperature drops sharply to the dew point, causing the water vapor to condense into tiny droplets that form a hazy layer of fog on the glass, most commonly on the inside of the windshield. This severely affects driving visibility and is particularly dangerous, such as when entering a car in summer and turning on the air conditioning. Factors that influence this include higher temperatures and humidity, which make it more likely to occur. To address this, turning on the air conditioning's defogging mode to direct airflow onto the glass is a common solution, or slightly opening the windows to balance the temperature difference between inside and outside, ensuring proper air circulation.
