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r area (cm2); usually p≥0.3w / cm2; ultrasonic wave propagating in the liquid the surface of the dirt can be cleaned, and its principle can be "cavitation" phenomenon explained: the ultrasonic vibration propagation of the sound waves in the liquid pressure reaches atmospheric pressure, the power density is 0.35w / cm2, the pressure time of ultrasonic sound waves vacuum or negative pressure can reach a peak, but in fact, no negative pressure exists, and therefore a large pressure is generated in the liquid, pulling the molecules of the liquid breaks into the cavity of a cavitation nucleus. This is very close to a vacuum hole, which reaches a maximum in the reverse pressure ultrasonic rupture, cracking due to the strong impact of the generated surface of the object hit the dirt off. This phenomenon caused by the shock wave of numerous small rupture of cavitation bubbles generated is called "cavitation" phenomenon. Sound intensity can not be too small to generate cavitation. 0 && image.height> 0) {if (image.width> = 700) {this.width = 700; this.height = image.height * 700 / image.width;}} "style =" MAX-WIDTH: 700px "class = editor-pic-insert border = 0 alt = 201383