What Causes Windshield Fogging When Using Air Conditioning?

[EmersonMarie]

When the temperature inside the car is low and the outside temperature is high, the moisture in the outside air condenses into tiny water droplets upon contact with the cold glass surface, forming what we commonly refer to as fog. Fog essentially consists of these minute water droplets. The detailed explanation is as follows: 1. Principle: Under conditions of abundant moisture, light winds, and stable atmospheric layers, when relative humidity reaches 100%, the water vapor in the air condenses into fine water droplets suspended in the atmosphere, reducing horizontal visibility at ground level. This weather phenomenon is called fog. Fog occurs more frequently between February and April during spring. 2. Formation conditions: In meteorology, when suspended water vapor condensation in the atmosphere reduces visibility below 1 kilometer, this weather phenomenon is termed as fog. The conditions for fog formation are: first, cooling; second, humidification to increase water vapor content. Types of fog include radiation fog, advection fog, mixing fog, evaporation fog, and smog.