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Skeptityke comments on Open thread, August 4 - 10, 2014 - Less Wrong Discussion
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Physics puzzle: Being exposed to cold air while the wind is blowing causes more heat loss/feels colder than simply being exposed to still cold air.
So, if the ambient air temperature is above body temperature, and ignoring the effects of evaporation, would a high wind cause more heat gain/feel warmer than still hot air?
Yes, though ignoring the effects of evaporation is ignoring a major factor.
Yes, it's how hair dryers work.
Yes. Your body would try to cool your face exposed to hot air by circulating more blood through it, creating a temperature gradient through the surface layer. Consequently, the air nearest your face would be colder than ambient. A wind would blow away the cooler air, resulting in the air with ambient temperature touching your skin. Of course, in reality humidity and sweating are major factors, negating the above analysis.
Yes. This happens sometimes in a really wet Sauna.
But conditions in which you actually feel this also kill you in less than a day. You need to lose about 100 W of heat in order to keep a stable body temperature, and moving air only feels hotter than still air if you are gaining heat from the air.