With increase in porosity, the thermal conductivity of a solid substance
A)Increases
B)Decreases
C)Remains unchanged
D)May increase or decrease; depends on the solid

Question

Quizplus · Accepted Answer

With an increase in porosity, the thermal conductivity of a solid substance decreases because the presence of more pores means there is less solid material to conduct heat, and air or vacuum in the pores conducts heat less effectively than the solid material.

With Increase in Porosity, the Thermal Conductivity of a Solid