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Distinguish between Sound and Ultrasound Waves

Sunmay International | Updated: Sep 21, 2017
Source: Sunmay

What is Ultrasound or Ultrasonic? What's the difference between human hearing sound and Ultrasound? Can you distinguish between human hearing sound and ultrasound waves? This article will tell you the difference between them.

Ultrasound / Ultrasonic

The range of human hearing is about 20 Hz to 20,000 Hz. Ultrasound waves have frequencies above about 20,000 Hz (which is 20 kHz). As this is above the normal hearing range for humans, we cannot hear ultrasound.

Frequency Range of Human Hearing Sound and Ultrasound.jpg

Ultrasonic Vibrations

Ultrasonic vibrations are high-frequency sound waves beyond the range of human hearing.

Cold Boiling

When propagated in fluids, ultrasonic vibrations cause the formation of microscopic bubbles, or cavities, and the water appears to boils. Some observers call this "cold boiling". The cavities rapidly collapse and send out shock waves. Microorganisms in the fluid are quickly disintegrated by the external pressures. The formation and implosion of the cavities are known as cavitation.

Process of Cavitation.jpg

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