How does condensation on the windscreen of a car work? How does it appear? What are some ways to get rid of it?
In: Physics
The windscreen is colder than the dewpoint (condensation temperature) of the air. When the warmer air hits the cold windshield it cools the air, the air can’t hold all its water vapour anymore, and the excess condenses out as liquid drops on the cold surface.
To get rid of it you need to raise the temperature of the air over the window back above the dew point. You can do that by heating the window directly or by blowing warmer dryer air over it.
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