Question text
22 Cotton wool is a good thermal insulator. It consists of many threads of cotton which are tangled together to make a material which can easily be pulled apart or compressed. The diagram shows the structure of cotton wool. cotton wool threads Why is cotton wool a good thermal insulator? A Each thread is very thin. B It has a large surface area because it is made of many threads. C It has a low density because of the trapped air. D It traps air and prevents convection.
22 Cotton wool is a good thermal insulator.
It consists of many threads of cotton which are tangled together to make a material which can
easily be pulled apart or compressed. The diagram shows the structure of cotton wool.
cotton wool
threads
Why is cotton wool a good thermal insulator?
A Each thread is very thin.
B It has a large surface area because it is made of many threads.
C It has a low density because of the trapped air.
D It traps air and prevents convection.
Select your answer: