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The weather forecast would be much clearer if they
Posted by nt moore (more from nt moore) on Thu, 8 Jan 2004 14:13:29
In Reply to: Re: -25 celsius this morning, car was not happy (+), stevec, Thu, 8 Jan 2004 13:49:25
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The weather forecast would be much clearer if they talked about the heat flux from your skin, ie how long will it take for a patch of skin to be frostbitten, or how many joules of heat, per second will you lose on a 100cm^2 patch of skin. This would be much more instructive.
Air is actually a rather decent insulator (when compared to water or other solids). Its my guess that 0F with 20mph wind would feel much colder than -30F with no wind - That's a natural statement though as heat flow through convection (wind blowing) is generally much more signifigant than that through conduction (no wind). In any case the only thing your body knows is that heat is flowing in or out of your skin. That's why 50F cold water from the tap on hands that have been in cold air for a while creates a "burning" sensation. You skin is registering the flow of energy into your hands - so far as I know there's no biological mechanism for measuring absolute temperature - just gradients.
Nathan
posted by 128.101.22...
Posts in this Thread:
- -25 celsius this morning, car was not happy (+), MatthewB, Thu, 8 Jan 2004 10:34:09
- -31 this morning(+), MatthewB, Fri, 9 Jan 2004 07:46:00
- Matthew just make sure I'll make it until this Saturday, Pierre in Ottawa, Thu, 8 Jan 2004 19:52:57
- As with many things, we blame our current conditions..., TKC, Thu, 8 Jan 2004 13:22:34
- I feel the same way. -35C with the wind and it's not, Joe_MTL, Thu, 8 Jan 2004 12:11:19
- Re: -25 celsius this morning, car was not happy (+), TML
, Thu, 8 Jan 2004 10:45:32 - Wind chill, Chuck, Thu, 8 Jan 2004 10:44:47
- where are you? nm, elSVT, Thu, 8 Jan 2004 10:42:18
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, Thu, 8 Jan 2004 11:11:49