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Supersonic liquid jets were produced in air by means of a spring‐loaded injector. At high jet velocities another type of breakup seems to occur besides the classical Rayleigh surface tension breakup, and the sinuous aerodynamic breakup. Rotationally symmetric waves are formed, and appear to ``break'' analogous to wind‐produced waves on a body of water. The rate of cavitation of jets in water was studied for several jet velocities above the speed of sound in air.