Heat Transfer
The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Steady state conduction
Forced convection
Natural convection
Transient conduction

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Heat Transfer
Leidenfrost point is a term concerned with the

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

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