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  2. I understand "acoustic particle velocity" by that term. Sound wave has different types and also different components. One is sound pressure which is scalar and the other is particle velocity which is vectoral. Acoustic particle velocity can be explained clearly as; imagine a volume of air which has imaginary closed boundary ( like an arbitrary control volume visualization ), when sound wave passes through that volume of air, it makes move some air in that particular volume and when that happens around a membrane structure, it creates a pressure difference, that is sound pressure. However, we a
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