Travel Reference
In-Depth Information
Figure 26-1. Heat loss by radiation
No vapor barrier system works well at temperatures above freezing because too much
water accumulates. Even at lower temperatures the only vapor barrier system widely used
isinfootwear.Althoughsuchbootsdokeepfeetwarm,applicationofantiperspirantstothe
feet and frequent sock changes are needed to avoid problems related to perpetual wetness.
Convection
Air in contact with skin is warmed to the skin's temperature. When the warmed air is
displaced, cool air that replaces it is also warmed. Since the heat that warms the air comes
from the skin, body heat is lost as the warmed air moves away.
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