Posted by jimg.allentown on January 13, 2022 at 07:11:16 from (24.115.194.186):
In Reply to: Wind Chill posted by DRussell on January 12, 2022 at 04:44:49:
The answer to your question is two factors at work.
First is evaporation. When any liquid (water in this case) changes state from a liquid to a gas, it absorbs energy (heat) which reduces it's temperature. In your case, when you are moving, some of the liquid water is evaporating and therefore reducing the temperature on the outside of your windshield.
Second is the temperature differential. In scientific terms, there is no such thing as cold. Only relative levels of heat. So, taking into account that the outside air is (as you stated) 11 degrees, it is well below the freezing point of the water on your windshield. In still air, the heat moves from your defroster inside to the glass in the windshield. That warms the ice to above the freezing point of the water (ice). Once you begin moving, you have 11 degree air removing the heat from the outside of the windshield so the malted ice refreezes.
Wind chill is based on evaporation from a moist surface. It primarily affects flesh. It does not and cannot affect a dry hard material like iron or steel or aluminum.
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