Question

question 29 of 30
which of the following is the best thermal insulator to reduce the transfer of
heat by convection?

a. air
b. a vacuum
c. alcohol
d. water

Explanation:

Convection requires the movement of particles (like in fluids or gases) to transfer heat. A vacuum has no particles, so heat transfer by convection is impossible there. Air, alcohol, and water have particles that can move, allowing convection. So a vacuum is the best insulator against convective heat transfer.

Answer:

B. A vacuum