Single bubble sonoluminescence (L) occurs when a gas bubble is trapped acoustically in a liquid and collapsed so strongly that the energy focusing leads to light emission. The objective of this thesis was to study the effective parameters on single bubble sonoluminescence by a hydrochemical model. For this purpose the bubble dynamics was simulated by numerical solution of the Rayleigh-Plesset and the gas state equations. At first the effect of liquid temperature on L was calculated. For this purpose L from an argon bubble in water at three temperatures, 2.5, 20 and 33 o C were compared which exist experimental results for them. We found that when the liquid temperature is decreased, the maximum radius of bubble (R max ) is decreased too. Accordingly, the gas temperature inside the bubble is increased. We have analyzed the reasons of these effects. The L intensity is also increased as the inside temperature of the bubble is increased. The rates of the microscopic processes of the light emission have been calculated. They are radiative recombination of electron and ions, electron-atom and electron-ion bremsstrahlung. We have shown that radiative recombination is the dominant process. We found that decreasing the static pressure leads to lessen the bubble instabilities and intensities. The higher P 0 , the brighter bubble. Diagrams have been drawn under diffusive equilibrium conditions and diagram phases are plotted. Finally there is a comparison between L from argon in water an L from argon in the 85wt% sulfuric acid. It has been indicated the bubble in the acid is brighter than the bubble in the water. The maximum normalized radius of the acid bubble is greater than the other and takes a longer time to reach its maximum radius. It's because of more density and viscosity and less surface tension of sulfuric acid.
