Question

Which of the following materials has the highest thermal conductivity?

• A. Wood
• B. Air
• C. Copper
• D. Glass

Hint:

Always remember: metals like copper and silver have very high thermal conductivity, while wood, glass, and air are poor conductors.

Answer 1

The Correct Option is C

Thermal conductivity refers to a material’s ability to conduct heat. A higher thermal conductivity means the material can transfer heat more efficiently.
Among the given materials:
Copper: Thermal conductivity $\approx$ 385–400 W/m·K
Glass: Thermal conductivity $\approx$ 0.8–1.0 W/m·K
Wood: Thermal conductivity $\approx$ 0.1–0.2 W/m·K
Air: Thermal conductivity $\approx$ 0.025 W/m·K
Copper, being a metal with free-moving electrons, is an excellent conductor of heat and far surpasses the other materials listed.
Thus, copper has the highest thermal conductivity among the given options.