A piezoelectric transducer, immersed in a water bed, converts a highfrequency electronic signal into a high frequency mechanical oscillation.

The water tries to follow the high frequency mechanical oscillation but cannot due to its mass inertia. A momentary vacuum and strong compression are produced in the water.

In the negative oscillation of the transducer the momentary vacuum causes the water to cavitate into a vapor at low temperature and pressure. In the positive oscillation of the transducer, high pressure compression waves are produced and by focusing the pressure waves on the surface of the water, very tiny droplets (average one micron in diameter) of water are generated which are quickly absorbed into the air stream.