Question

how do woollen clothes keep us warm in winter

Answer 1

woollen cloths trap the air inside the cloth and will not release the air. In this way woollen clothes keep us warm in winter

Answer 2

Cotton clothes are thin and do not have space in which air can be trapped thus, cotton clothes do not prevent heat coming out of our body.
Woollen clothes keep us warm durinv winter because wool is a poor conducter of heat and it has air trapped in between the fibers.
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