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Wind chill
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== Explanation == A surface loses heat through [[Thermal conduction|conduction]], [[evaporation]], [[convection]], and [[radiation]].<ref>{{cite book|author1=Vincent J. Schaefer|author2=John A. Day|author3=Jay Pasachoff|title=A Field Guide to the Atmosphere|url=https://books.google.com/books?id=q0QI19T_POkC|year=1998|publisher=Houghton Mifflin Harcourt|isbn=0-395-97631-6}}</ref> The rate of convection depends on both the difference in temperature between the surface and the fluid surrounding it and the velocity of that fluid with respect to the surface. As convection{{clarify|Is the heat transfer in this layer not primarily conduction?|date=April 2024}} from a warm surface heats the air around it, an insulating [[boundary layer]] of warm air forms against the surface. Moving air disrupts this boundary layer, or epiclimate, carrying the warm air away, thereby allowing cooler air to replace the warm air against the surface and increasing the temperature difference in the boundary layer. The faster the wind speed, the more readily the surface cools.{{citation needed|date=April 2024}} Contrary to [[List of common misconceptions|popular belief]], wind chill does not refer to how cold things get, and they will only get as cold as the air temperature. This means [[radiator]]s and [[Plumbing|pipes]] cannot freeze when wind chill is below freezing and the air temperature is above freezing.<ref>{{Cite web |title=Windchill Terms and Definitions |url=http://www.weather.gov/os/windchill/windchillglossary.shtml |url-status=dead |archive-url=https://web.archive.org/web/20080917044758/http://www.weather.gov/os/windchill/windchillglossary.shtml |archive-date=September 17, 2008 |access-date=July 3, 2024 |website=[[National Oceanic and Atmospheric Administration]]}}</ref><!--not controversial, but looking for a source -->
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