What is a hydrophone?

device for pumping water
water tank
water level meter
microphone
A hydrophone is a microphone designed to be used underwater for recording or listening to underwater sound.A hydrophone can detect airborne sounds, but will be insensitive because it is designed to match the acoustic impedance of water, a denser fluid than air. Sound travels 4.3 times faster in water than in air, and a sound wave in water exerts a pressure 60 times that exerted by a wave of the same amplitude in air.
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device for pumping water
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