Question: Thermal conductivity of refractory bricks Increases with decrease in porosity Decreases with decreases in porosity Is independent of its porosity and is maximum for insulating

Thermal conductivity of refractory bricks
Increases with decrease in porosity
Decreases with decreases in porosity
Is independent of its porosity and is maximum for insulating bricks
Increases with the amount of air entrapped in pores

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