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Definition of Ultrasound Source：Suzhou Jiahui Ultrasonic Technology Co., Ltd         Release time：2018-03-04 What is ultrasound? Ultrasound is a kind of sound wave whose frequency is higher than 20 kilohertz (Hz). Normal people can hear 20 Hz (Hz) - 20 kHz (kHz) sound waves. Sound waves below 20 Hz are called infrasound or subsonic waves. Sound waves over 20 kHz are called ultrasonic waves. Ultrasound is a kind of mechanical vibration. Usually it propagates in elastic medium by longitudinal wave. It is a form of energy and momentum. Its difference is that the frequency of ultrasound is high, the wavelength is short, and the propagation along a straight line in a certain distance has good beam and directivity. Previous：Overview of ultrasonic cleaning machine Next：Selection and Attention Points of Cleaning Agent for Ultrasound Cleaner