Thermal conductivity of refractory bricks_________________?
Correct answer: A. Increases with decrease in porosity
- A. Increases with decrease in porosity
- B. Decreases with decreases in porosity
- C. Is independent of its porosity and is maximum for insulating bricks
- D. Increases with the amount of air entrapped in pores
Explanation
Solid refractory material conducts heat much better than the air trapped in its pores, so reducing porosity generally increases thermal conductivity. This is why highly porous bricks are preferred as insulating refractories.
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