Question

in winter cotton shirt cannot keep us warm as a woolen sweater why

Answer 1

Shirt are thin than woolen sweater. Also, Willem sweater have pores which trap air between them and don't allow the heat to get released from the body, while shirt that is mostly of cotton material don't have such pores in which it can trap air.

Answer 2

Because cotton absorb our sweat while woolen clothes have pores which trap heat
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