Why Are There Water Droplets Inside the Windshield?

[LeLiam]

In winter, the external temperature of the car is low while the internal temperature is high. The warm air inside the car condenses into small water droplets when it meets the cold glass. Reasons for window fogging: 1. Large temperature difference between inside and outside the car: Due to the temperature difference, the windows are prone to fogging. This happens because the window glass, in contact with the outside, is colder, causing the water vapor inside the car to condense on the glass and form fog. 2. Window temperature below the dew point: At a certain air humidity, if the window temperature is lower than the dew point, condensation easily forms on the surface of the window, leading to fogging on the windshield. 3. Temperature difference between the two sides of the window: If the temperatures on either side of the window are different, the surface with the lower temperature will have a lower saturated vapor pressure than the surrounding environment, causing water vapor to gather on the glass surface in the form of tiny droplets, resulting in fog.