Mark Rober has a master's degree in mechanical engineering. For nine years, he used his degree working for NASA.
He's a scientist through and through.
So when it comes to all the myths and rumors about how to defog your car window in the morning, he decided to science it.
Mark explains that hot air can absorb more moisture than cold air. Therefore, the fastest way to evaporate up fog or frost is with as much hot, dry air as possible.
That means: put the fan on maximum, to really get that wind blowing. Make sure it's outside air, not recirculated air, as your cabin is likely more humid. In fact, you may want to crack the windows.
Turn the temperature up to its hottest setting, and flip on the A/C.
Now you should be able to defrost your window in half the time!
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