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Microorganism Controlling by Ultrasonic Vibrations -

These are high frequency sound waves. If propagated in fluids, sound waves cause microscopic bubbles to form, and the water appears to boil (also called cold boiling)

.The bubbles rapidly collapse, giving tiny cavities and sending out shock waves. Microorganisms in the fluid are rapidly disintegrated by the external pressures.

A device called cavitron is used by dentists to clean teeth. There are ultrasonic machines to clean dental plates, coins, jewellery etc.