All forms of heat transfer may occur in some systems at the same time. Heat transfer is a path function, as opposed to a state quantity.

Heat transferthrough the stationary air layer immediately adjacent to say one millimeter or so from an interior wall, or from a warm pot placed on a counter, are examples of conductiveheat transfer.

When a person engages in elevated levels of physical activity, the body requires additional fuel which increases the metabolic rate and the rate of heat transfer. The body must then use additional methods to remove the additional heat produced in order to keep the internal temperature at a healthy level.

Forheat transfer from the outer surface of the body, the convection mechanism is dependent on the surface area of the body, the velocity of the air, and the temperature gradient between the surface of the skin and the ambient air.

Therefore, the maximum ofheat transfer will occur when the skin is completely wet.

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