Why does the outside of the car window fog up when driving at night?

1 Answers
JaceDella
07/30/25 3:24am
When the temperature inside the car is higher than the outside temperature, the large temperature difference between the warm interior and cold exterior causes fogging. Here are some solutions: Ventilation defogging: When the fog is not heavy, you can appropriately open both windows to allow air convection. This eliminates the temperature difference on both sides of the windshield, making it difficult for fog to form. Turning on the air conditioning cold air can quickly remove fog in a short time. Defogging spray: The principle of defogging spray is simple - spraying it on the windshield forms a protective film that prevents water vapor condensation. However, this protective film has a short validity period and requires repeated long-term spraying to maintain effectiveness.
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