Fogged up, “unclear” windows are not just an inconvenience, they present a “clear” driving danger. When the air temperature inside a vehicle is warmer than the temperature outside, the water molecules inside the cabin can go through a process of condensation and collect on the windshield and windows, where the dueling temperatures collide. This causes
Car windows fog up when the temperatures inside and outside the car are very different. In other words, in the summer it happens when a windshield, cooled by cabin A/C, meets hot outside air. In the winter, by contrast, it happens when a windshield, heated by the cabin heater, meets the cold outside air. Therefore,
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