| How To Stay Warm The following simple examples should help illustrate the battles of staying warm. Conductive heat transfer ,occurs between objects in contact, such as warm skin and cold air, or a finger and a hot stove. Convective heat transfer involves motion, such as air currents that carry heat away. Radiant heat refers to the transfer, of heat through space, such as the sun radiating heat to the earth. Evaporative heat transfer involves the heat required to evaporate body moisture from our skin (insensible perspiration). Lastly, respiration heat is lost through our expelled breath. One scientific study found that the human body at rest losses 76% of its' heat due to conduction, convection and radiation; the remaining 24% is lost through evaporation, insensible perspiration and respiration.The good news is that modern hi-tech materials give us a lot of ammunition to work with. Thick
insulation Tith tiny dead-air spaces used in sleeping bags and sleep :Dads,
and thick clothing such as fleece or pile are ?ffective against conductive
and convective heat loss. Tiight-weave, wind-proof and reflective fabrics
can greatly -educe convective and radiant heat loss, but often do sothe
cost of trapping unwanted condensation. vaporative heat loss can be the
most difficult to tackle. v can however, be addressed by the use of vapor
barriers -etween the skin and the insulation (but never around face).
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