Wind Chill Index Chart from the National Weather Service
The question posed by Lanny is interesting, because the Science is very fuzzy. There are many "definitions" of Wind Chill (Index, Factor...Etc...). do you remember the so called "Discomfort Index". This is an attempt to describe how humans and animals feel as a result of wind on exposed skin surface.
This is about sensationalising the Weather report; in other words, it is more sensational to report the temperature much lower than it really is. Most importantly, this has nothing to do with the technical aspects of the laws of thermodynamics; in other words, if the temperature is 40 degrees, and the wind velocity is 20 MPH, yielding a Wind Chill of 30 degrees, water will NOT freeze; this says it all; this is a matter of perception not reality; it supposedly states that your bare skin would feel like it was 30 degrees, because of the rate at which the wind is blowing.
So, since your car surface does not perceive anything, and since water and fruit freezes at real temperatures, not at human being - bare skin perceived temperatures I would say that the wind would have no effect on your car or the fruit, unless the actual temperature as measured in still air was at or below freezing.
Following is but one definition of Wind chill; if you want many more, just GOOGLE up the phrase:
Wind Chill Index(Wind Chill Factor, Chill Factor) Index used to determine the relative discomfort resulting from a specific combination of wind speed and air temperature, expressed by the loss of body heat in watts per square meter (of skin).
Dave Israel
Makes you think about what we call global warming. Maybe the name is wrong, but something IS happening: Freaky stuff in one neck of the woods does a domino effect all over, including shrinking ice caps in the Arctic and true winter here. We will go back to nice sunny weather tomorrow, but do not expect to wear Bermuda shorts and beach zories next holiday season!
ReplyDelete