Question

Which material is the best heat insulator?

metal

wood

plastic

glass

Answer 1

Of the materials listed wood is the best insulator. It would be the least hot if exposed to similar temperatures.

Answer 2

Wood

Step-by-step explanation:

The measure of any material to conduct heat is called its thermal conductivity. The thermal conductivity of metal is very high as compared to insulators and semiconductors.

The thermal conductivity of wood is 0.12-0.04 W/m K. Plastics have thermal conductivity of 0.2 W/m K. The thermal conductivity of fiber glass or foam glass is 0.045 W/m K

Wood is a best heat insulator. This is because, the atoms of wood have much tightly bound electrons.

Hence, the correct option is (b).