The accurate identification of the transition velocities U_trans in bubble columns (BCs) is important for their effective design, operation, and scale-up. In this work, a novel parameter, namely, the new hybrid index (NHI), was developed and successfully applied to gas holdup and pressure fluctuations recorded in various BCs operated with water and aqueous solutions of alcohols (ethanol and propan-2-ol). The first U_trans was identified on the basis of a well-pronounced local NHI minimum, whereas the second U_trans was distinguished by the point from which the NHI profile levels off. It was concluded that the main U_trans depend on the type of gas-liquid system and sparger used. A set of several U_trans is reported.