Low thermal conductivity of heat insulating materials is due to its_________________?
Correct answer: B. High proportion of air space
- A. Dense structure
- B. High proportion of air space
- C. High specific heat
- D. None of these
Explanation
Insulating materials contain many small air spaces, and trapped air has very low thermal conductivity. A dense structure generally provides more solid paths for heat conduction rather than better insulation.
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