Electrochemistry Mathematical models Bubble columns Competition Diffusion Boundary Layer Economic and social effects Electricity Electricity generation Electrodes Energy market analysis Energy resources Energy utilization Environment Fiji Flow Transition Flow of Fluids--Two Phase Fluid dynamics Gas absorption Gases--Mixing Liquids--Mixing Logistic substitution Logistic substitution approach Logistics MASS TRANSFER MOLECULAR DIFFUSIVITY Market analysis Marketing Mass Transfer Mass transfer Nonelectric final energy forms