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Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. Applications of acoustics are for instance the audio and noise control industries.

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Does of pressure wave always leads or lags behind displacement wave in case of sound waves?

Do pressure waves (phase angle) always lead or lag behind a displacement wave in case of sound waves? Or is it something that does not happen "always" and depends on the initial configuration of the s …
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