Whilemomentum,heat,andmasstransferdevelopedindependentlyasbranchesofclassicalPhysicslongago,theirunifiedstudyhasfounditsPlaceasoneofthefunda-mentalengineeringsciences,Thisdevelopment,inturn,lessthanhalfacenturyold,con-tinuestogrowandtofindapplicationsinnewfieldssuchasbiotechnology,microelectronics,nanotechnology,andpolymerscience.Evolutionoftransportphenomenahasbeensorapidandextensivethatcompletecoverageisnotpossible.While.Wehaveincludedmanyrepresentativeexamples,ourmainemphasi