Heat Transfer
Nusselt number is the ratio of the

Temperature difference to the temperature gradient at the wall
Temperature gradient of the wall to that across the entire pipe
Heat flux at the wall to that across the entire pipe
None of these

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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