Conservation principles--Fluid stresses and flux laws--The differential equations of the boundary layer--The integral equations of the boundary layer--Momentum transfer: Flow inside cylindrical tubes--Momentum transfer: Flow over external surfaces--Heat transfer: Laminar flow inside smooth tubes--Heat transfer: Turbulent flow inside smooth tubes--Heat transfer: The laminar external boundary layer--Heat transfer: The turbulent external boundary layer--The influence of temperature-dependent fluid properties--Convective heat transfer at high velocities--Mass transfer: Formulation of a simplified theory--Mass transfer: Some solutions to the conserved Property Equation--Mass transfer: Some examples of evaluation of the driving force