Wind chill
Wind Chill
Wind chill (pronounced: /wɪnd tʃɪl/), also known as wind chill factor, is a calculated measurement of the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air.
Etymology
The term "wind chill" comes from the chilling effect of wind on the skin. It was first used in Antarctic exploration, and became popular in the 20th century.
Definition
Wind chill is the lowering of body temperature due to the passing-flow of lower-temperature air. Wind chill numbers are always lower than the air temperature for values where the formula is valid. When the apparent temperature is higher than the air temperature, the heat index is used instead.
Calculation
The calculation of wind chill is complex and involves a mathematical formula that takes into account the temperature of the air and the wind speed. The formula is:
T_wc = 35.74 + 0.6215T - 35.75(V^0.16) + 0.4275T(V^0.16)
where T_wc is the wind chill index, based on the Fahrenheit scale; T is the air temperature in degrees Fahrenheit, and V is the wind speed in miles per hour.
Related Terms
- Heat Index: A measure of how hot it really feels when relative humidity is factored in with the actual air temperature.
- Apparent Temperature: The temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity and wind speed.
- Thermal Comfort: The condition of mind that expresses satisfaction with the thermal environment and is assessed by subjective evaluation.
External links
- Medical encyclopedia article on Wind chill
- Wikipedia's article - Wind chill
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