Resonant absorption of high‐frequency sound was tried as a new method for the determination of bubble growth. In the 85‐cm bubble chamber at DESY, filled with a Ne/H2mixture (90/10 mole%) at 29°K, the growth rate of subvisible bubbles was measured with 122‐kHz ultrasonics for time intervals between 10 and 70 &mgr;sec after the passage of a particle. The results were evaluated according to the theory of Trammell and were compared with an extrapolation from optically measured values under the assumption of anR∼t1/2dependence for the bubble radius.