A student observes that when a folded sweater is pressed down and released, it easily gets pressed and then, instantly bounces back in shape. The student concludes that thick woollen fibres can trap a lot of air within their strands. Which option explains how woollen sweaters protect us from cold weather?
a) Convection provided by the wool fibres and insulation by air
b) Insulation provided by the wool and conduction of body heat
c) Insulation provided by the wool fibres and air trapped in them
d) Convection of heat by the human body and reflection by wool
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Answer:
d is correct answer . hope it will help u
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