Heat Transfer
Leidenfrost point is a term concerned with the

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

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Heat Transfer
Fouling factor

Is a dimensionless quantity
None of these
Accounts for additional resistances to heat flow
Does not provide a safety factor for design

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