Animals such as bats and porpoises use ultrasound for locating prey and obstacles. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Ultrasound imaging or sonography is often used in medicine. Ultrasonic devices are used to detect objects and measure distances. Ultrasound is used in many different fields. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz. The physical principles of acoustic waves apply to any frequency range, including ultrasound. This frequency is the approximate upper audible limit of human hearing in healthy young adults. Ultrasound is sound with frequencies greater than 20 kilohertz.
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