Question

Why does trapped air in a vacuum flask reduce heat loss by conduction?

Answer 1

Step-by-step explanation:

The answers are:

1) D

2) B

3) D

4) C

5) A

6) A

7) D

8) D

9) A

10) B

11) C

12) C

13) C

14) B

15) B

Answer 2

Having a vacuum prevents conduction from occurring completely bc there are no molecules to transfer the heat...since air is a poor conductor of heat, having trapped air in the sponge and hollow plastic stopper help prevent heat loss by conduction