Friday, November 4, 2011

cold, wind, and temperature

Since it seems as if winter temperatures will finally arrive, a word about wind chill.

Wind chill was developed to describe how wind velocity changes the way temperature feels to exposed skin.

We hear about wind chill so often that many people have become confused. Only warm blooded animals with bare skin, humans basically, are affected. If the temperature is 35 but the wind chill is 16, a container of water placed outside will not freeze.

Wind might make the water freeze more rapidly at an ambient temperature of 32 degrees by carrying away heat. Entropy always increases, after all.

So fear not. Your car will die equally well at 16 degrees or minus 10 with the wind chill.

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