ultrasound
Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 kilohertz (20,000 hertz) in healthy, young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz. Wikipedia, Ultrasound
See Also
15.09 - Dissociating Water with Ultrasonic Vibration - Puharich
Cavitation
Sonication
Ultrasonic
Page last modified on Friday 01 of March, 2013 04:46:35 MST