What is the reason for the persistent fogging on the outside of the windshield?

[OClara]

The reason for the persistent fogging on the outside of the windshield is the presence of moisture on the exterior of the windshield after rain. Here are the relevant explanations: 1. Temperature difference between inside and outside the car: The main cause is the significant temperature difference between the inside and outside of the car. When cold air reaches the glass, external moisture condenses on the glass due to the cold. This is a basic principle of physics. A large temperature difference between the interior of the vehicle and the outside, or during rainy conditions, can lead to fogging on the windshield and door glass surfaces, posing a safety hazard for driving. 2. Precautions: Regularly clean debris and snow near the air conditioning intake to ensure the proper functioning of the air conditioning system. Generally, the ventilation mode should be set to external circulation to facilitate air flow.