What causes a windshield to fog up on the inside? I understand it’s related to the differences in temperature, but that’s as far as I understand. What can one do to resolve it?
Sorry if the flair is wrong 🙂
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Here’s an article I found by Google searching “Why do windshields fog up on the inside?” https://www.allstate.com/resources/car-insurance/foggy-windows
Air usually has some amount of water vapor in it. When this air + water is exposed to something cold and it cooled below the [dew point](https://en.wikipedia.org/wiki/Dew_point) water condenses. This is seen also with a cold object like a drink in a humid summer day.
Here’s something I found by Google searching for “how to use defroster” https://magazine.northeast.aaa.com/daily/life/cars-trucks/ultimate-guide-defog-windows-car/
Blowing warm and dry air past the windshield causes water condensed to evaporate again. On some cars it’s turning knobs. On some it’s pressing a defroster button. Either way, reading your car manual gives you the manufacturer’s recommended method. If your car does not have a printed manual, Google searching your car name and manual, like “ford focus manual” will bring up a link.
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