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Computer‐automated radioactive particle tracking (CARPT) data obtained in a 0.162 m air‐water bubble column operated at ambient pressure have been analysed. The superficial gas velocity (Ug) has been varied in the range 0.02‐0.12 m/s under constant liquid height 1.04 m. A perforated plate (82 holes ø 0.4 mm, free plate area 0.05 %) distributor has been used. The Kolmogorov entropy (KE) vs. Ug allows identification of the transition velocity (Utrans = 0.064 m/s) between bubbly and transition regimes. KE models for both regimes have been also developed. The quality of mixedness (QM) concept shows that QM(upper zone) ⊕ QM(lower zone) at Utrans = 0.064 m/s.