as cold as ...

Hi everybody,
Can anyone direct me (a link /artical/ source-including in a post)
to info about the following:

Is there a formula that could be used to compute the relative chilling effect /relative heat loss (to a person) of air at a certain temp. vs water at that same temp.
i.e. "a water temp of ## degrees chills you as fast as an air temp. of ##degrees"?

This question arose as a result of a conversation with a few nondiving friends who wondered why divers wear "thermal protection" in, for example 75 degree water, when 75 degree air is relatively comfortable for shorts, etc.
I'm aware of most of the causes, (greater density of water vs. air, for one ) but I can't find a conversion formula, if there is one.
Thanks in advance,
Mike

Get yourself a copy of Immersed 2002 Winter edition
There is exactley what you are looking for in there

http://www.immersed.com/Issues/Default.htm

Try this page, I think it has all the calculations you are looking for.
http://www.islandnet.com/~see/weather/life/coldimpacts.htm

http://www.kerrheating.com/online_Training/HomeHeating/PDF/Heat_Transfer.PDF

Here's another one you can try.

Diving Concepts website has information on the difference between air and water, bias towards drysuit use, I'm guessing.

A general rule for this as well....water removes heat from your body about 20 times as fast air does. So...think of it as one heck of a windchill.