Clothing & comfort  Convection

 Heat loss or gain by convection process from human body depends upon the surrounding air temperature and air movement. 

 Air passing over the skin 

 surface not only evaporates moisture but also transfer sensible heat to or from the body. 

 The faster the rate of air movement, the more the convective heat loss. 

 The larger the body surface area, the greater the rate of heat loss. 

(c) Conduction :

  With direct contact of the human body with physical objects such as chair, floor etc conductive heat loss or gain occurs. 

 Conduction allows us to loose or gain heat when lying, or sitting on floor or other surfaces.

  Clothing slows down conductive heat loss 

 Clothing also acts as insulator