MCQ
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?
- AConvection provided by the wool fibres and insulation by air
- BInsulation provided by the wool and conduction of body heat
- ✓Insulation provided by the wool fibres and air trapped in them
- DConvection of heat by the human body and reflection by wool