The wollen cloth keep us warm because
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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 during winter because wool is a poor conductor of heat and it has air trapped in between the fibres.
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Because air is entrapped between the thread like fibres of woolen. As air is a bad conductor of heat . The heat remains in contact with our body and hence makes us feel warm.
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