In this work an attempt is made to study the effects of heat and mass transfer on MHD free convective viscous incompressible electircally conducting fluid boundary layer flows past a vertical plate.In chapter 1 the effects of radiation absorption and chemical reaction on unsteady MHD free convective flow through porous medium is studied.In chapter 2 the effect of magnetic field and radiation on unsteady MHD flow in the presence of thermal diffusion.In chapter 3 thermal diffusion on unsteady heat and mass transfer flow with variable temperature and mass diffusion is studied.In chapter 4 the...