Review of various rate theories, Gibbs and Langmiuir isotherms, diffusion in solids, liquids and gases. Mass Transfer: interfacial phenomenon-significance, interfacial turbulence, electrocapillary effects, enhanced vaporization electrochemical theory of smelting and refining. Process analysis, impinging jets and submerged jets. Continuous flow systems. Analysis of single particle reactions - correlation with packed beds and fluidised beds.