Question

briefly explain why porosity decreases the thermal conductivity

Answer 1

Porosity decreases the thermal conductivity of ceramic and polymeric materials because the thermal conductivity of a gas phase that occupies pore space is extremely small relative to that of the solid material.




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Answer 2

because the thermal conductivity of a gas phase that occupies pore space is extremely small relative to that of solid material. Furthermore, contributions from gaseous convection are generally insignificant.