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Why Do Car Windows Fog Up From the Inside? | RapidSmartFacts

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Created December 12, 2025

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Video Transcript

Full text from the video

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You're driving. It's cool, damp. Suddenly, your windshield turns

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cloudy. Why does fog form on the inside, not outside?

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Fog on glass is just tiny water droplets. Those droplets form when humid air

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hits a cooler surface. Inside, you're the source of humidity:

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breathing, damp clothes. Even wet shoes add to it. When moist air

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touches the colder window, it cools. Cooler air can’t hold as much

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water vapor. The extra water condenses into droplets on the inside surface.

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That’s why the defroster and fan help. Warm, dry air from

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