What Causes Fogging on the Outside of Car Windows on Rainy Days?
1 Answers
Because there is a temperature difference between the two sides of the glass, the side with higher gas temperature will form fog on the glass. Here are methods to prevent car window fogging on rainy days: 1. Proper use of the air conditioning system: The operation method is to park the car, start the air conditioning, turn the temperature adjustment button to the warm air direction, then press the defrost button, and use the warm air produced by the air conditioning to dry the fog on the windshield inside the car. When defogging, you can switch the air conditioning to external circulation to allow fresh outside air to enter the cabin. Setting the compressor and fan speed to 25°C or higher can speed up the defogging process. 2. Special use of anti-fog products: Before each use, spray evenly on the window and wipe clean, forming a transparent protective film on the glass to prevent fog formation. One application can prevent fogging for about ten days to half a month, depending on the product's effectiveness. In summary, buying anti-fog spray is a convenient but not cost-effective solution, as its effectiveness is short-lived. 3. Open windows for cold and hot air convection: If the fog is not heavy, you can open a small gap in the side windows to allow air convection inside the car, gradually bringing the interior temperature closer to the outside temperature, which will disperse the fog. The advantage is that it achieves the same effect as using the air conditioning without increasing fuel consumption. However, during extreme cold or heavy rain, it is recommended to intermittently open and close the windows.
