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===About Ultrasound===
: [[Ultrasound]] is too high [[pitch]]ed for a [[human]] to [[hearing|hear]].
===Applications===
: Cleaning - [[Ultrasound]] can be used to clean dirt from surfaces. The [[vibration]]s can create small bubbles in a [[water]] which work their way into cracks push the dirt out.
: Physiotherapy - [[Ultrasound]] can be used to massage parts of the body which can stimulate healing and repair.