Heat Transfer
With increase in porosity, the thermal conductivity of a solid substance

Decreases
Remains unchanged
Increases
May increase or decrease; depends on the solid

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Heat Transfer
Leidenfrost point is a term concerned with the

Heat transfer between two highly viscous liquids
Concentration of a corrosive solution by evaporation
Boiling of a liquid on a hot surface
Condensation of the saturated vapor on a cold surface

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