Wind chill

Wind chill is the apparent temperature felt on the exposed human (or animal) body owing to the combination of temperature and wind speed. Wind itself does not lower the actual temperature of objects, but can increase the rate of cooling[?]. Therefore, water will not freeze at a windchill of -10 Celsius if the actual air temperature is above freezing. What actually happens is that wind pushes warm air (warmed by the body) away from the skin, cold air replaces it, and the cooling process is accelerated. Wind chill effects can be minimized or even eliminated through the use of clothing that protects the skin.

The first wind chill formulas and tables were developed by the United States military during World War II, and were made available by the National Weather Service[?] by the 1970s. In 2001 the formulas were revised to reflect more accurate theories and testing than those done by the military.

External Links

• National Science Digital Library - Wind Chill Temperature (http://www.nsdl.arm.gov/Library/glossary.shtml#Wind_chill_temperature)
• An Introduction to Wind Chill (http://avc.comm.nsdlib.org/cgi-bin/wiki_grade_interface.pl?An_Introduction_To_Wind_Chill) : A lesson plan on Wind Chill.