Should You Use Cold or Warm Air to Defog Your Car?

[FinnRose]

Both warm and cold air can be used to defog car windows. Here are the methods for defogging car glass: 1. When the fog is light, open the windows to reduce the temperature difference between the inside and outside of the car, which will help the fog dissipate; 2. Turn on the heating system before driving; 3. Turn on the car's air conditioning to blow cold air; 4. Activate the car's defogging function; 5. Apply a homemade anti-fog solution (such as a mixture of dish soap and water or soapy water) to the windows, or place a dehumidifying box (like those used in wardrobes) inside the car. Reasons for car window fogging: 1. When humidity is high, the window temperature is lower than the dew point; 2. When the temperature is too low, the window surface becomes saturated with moisture, and the vapor pressure is lower than that of the surrounding environment; 3. Wet car floor mats; 4. Large temperature difference between the inside and outside of the car; 5. A noticeable temperature difference between the two sides of the window.