BPK 142 Lecture Notes - Clothing Insulation, Nerve Conduction Velocity, Basal Rate
18 Oct 2011
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Still _air__ is an excellent insulator, while __water__ is an excellent conductor. Heat conduction in water is about 25 times greater than in air. For example, heat transfer from skin to moving air or water. Wind chill index - gives the equivalent still air temperature for a particular ambient temperature at different wind velocities. The temperature gradient between the skin and air and the air velocity are important factors in determining convective heat loss. Convective heat loss during swimming is more than twice that during rest in still water: evaporation - the transfer of heat from the body surface through the change of. ___liquid__ water on the skin to a __gaseous___ water vapour in the environment. Because the superficial blood vessels in the __head__ do not constrict in the cold, the __head___ is an important source of heat loss - accounts for 30 - 35% of total heat loss at rest.
