Question

Black bears have thick fur that traps air. How does this air insulate the bear in winter ?
(1)The air reduces thermal (heat) energy flow to the environment.
(2) The air produces thermal (heat) energy to keep the bear warm.
(3) The air transforms chemical energy to thermal (heat) energy.
4) The air transfers thermal (heat) energy to the bear

Answer 1

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Answer 2

The correct answer is option A) The air reduces the thermal energy flow to the environment.

The heat of the body does not escape out, because the thick hairs on the body of the bear trap the heat. Moreover, the trapped air in the fur is heated by the warmth of the body.  Moreover, since the air is already present in the fur, no new air can be trapped. So, this air insulates the body through conduction and convection and hence limits the thermal energy flow to the environment, and keeps the body warm.