With increase in porosity, the thermal conductivity of a solid substance__________________?
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains unchanged
- D. May increase or decrease; depends on the solid
Explanation
Increasing porosity replaces more of the solid conducting path with gas-filled voids, and gases generally conduct heat much less effectively than solids. Therefore, the effective thermal conductivity usually decreases.
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