These studies consist of experiments, physical modelling, and numerical simulations concerning gas-induced injection and mixing of reaction inhibitors in vessels containing low viscosity liquids. The mixing times required to achieve a final mixing quality of 95 % were determined by means of a decolorization technique and a probe method (conductivity probes). The mixing time decreases with increasing gas flow rate, liquid level, eccentricity of the gas injection point, and with decreasing liquid viscosity. Based on fundamental physical principles, analytical models were developed which can be used to estimate, with an average precision of +/- 13 %, the mixing times measured on three different scales. The results of scale-up were additionally confirmed via numerical simulations. The results of these studies show that gas-induced mixing of reaction inhibitor solutions can represent a reliable safety system for preventing exothermal runaway reactions. Moreover, direct injection of gas may also be used for admiring additives during normal operation of reactors and storage tanks.