Quote:
Originally Posted by Rekna
Sorry but the laws of thermodynamics run counter to this thought. All that matters is the material constant, the change in temperature between the two surfaces, and the surface area.
Why do you think crushed ice melts so much faster than the exact same volume of solid ice? It is because of the surface area.
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Technically, when you pee you reduce your surface area because the skin around your abdomen will reduce in surface area relative to the quantity of material you have...released. Though it is a very, very small change peeing will reduce your surface area thus allowing you to better retain heat. Though the difference is probably too small to notice.
My proposal: Your body begins to shed fluid in cold weather because the cold causes blood vessels in your extremities to contract in order to better retain heat in your core. I don't know the mechanics, but it results in your kidneys excreting a larger volume of urine than would otherwise happen.
If you don't drink you will get dehydrated, which can contribute to your bodies susceptibility to hypothermia, etc. So oddly enough ensuring that you continue to pee by drinking water will help you remain warm
Even though drinking cold water when you are near hypothermia can be near unbearable.