Difference between revisions of "Wind-chill index"

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<div class="definition"><div class="short_definition">A means of quantifying the threat of rapid cooling during breezy or windy conditions  that may result in [[hypothermia]] in cold conditions.</div><br/> <div class="paragraph">The index is used to remind the public to minimize [[exposure]] when outdoors and to take  precautionary actions. In the late 1940s, Antarctic explorers Siple and Passel experimented with  measuring the time it took to [[freeze]] 250 grams of water in different [[temperature]] and [[wind]]  conditions. They developed empirical formulas relating these data to the rate of [[heat]] loss from  exposed human skin. They developed the following formula which was used to determine the  wind-chill index. At wind speeds of 4 mph or less, the [[wind chill]] temperature is the same as the  actual [[air temperature]]: <div class="display-formula"><blockquote>[[File:ams2001glos-We9.gif|link=|center|ams2001glos-We9]]</blockquote></div> where ''V'' is [[wind speed]] in mph and ''T'' is temperature in &deg;F.</div><br/> </div>
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<div class="definition"><div class="short_definition">A means of quantifying the threat of rapid cooling during breezy or windy conditions  that may result in [[hypothermia]] in cold conditions.</div><br/> <div class="paragraph">The index is used to remind the public to minimize [[exposure]] when outdoors and to take  precautionary actions. In the late 1940s, Antarctic explorers Siple and Passel experimented with  measuring the time it took to [[freeze]] 250 grams of water in different [[temperature]] and [[wind]]  conditions. They developed empirical formulas relating these data to the rate of [[heat]] loss from  exposed human skin. They developed the following formula which was used to determine the  wind-chill index. At wind speeds of 4 mph or less, the [[wind chill]] temperature is the same as the  actual [[air temperature]]: <div class="display-formula"><blockquote>[[File:ams2001glos-We9.gif|link=|center|ams2001glos-We9]]</blockquote></div> where ''V'' is [[wind speed]] in mph and ''T'' is temperature in &#x000b0;F.</div><br/> </div>
 
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Latest revision as of 16:29, 20 February 2012



wind-chill index

A means of quantifying the threat of rapid cooling during breezy or windy conditions that may result in hypothermia in cold conditions.

The index is used to remind the public to minimize exposure when outdoors and to take precautionary actions. In the late 1940s, Antarctic explorers Siple and Passel experimented with measuring the time it took to freeze 250 grams of water in different temperature and wind conditions. They developed empirical formulas relating these data to the rate of heat loss from exposed human skin. They developed the following formula which was used to determine the wind-chill index. At wind speeds of 4 mph or less, the wind chill temperature is the same as the actual air temperature:
ams2001glos-We9
where V is wind speed in mph and T is temperature in °F.