Second-Order Acoustic Fields: Relations Between Density and Pressure

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Abstract
In acoustics the relations between the excess pressure and the excess density neglect effects of the fluid flow. The object of this paper is to derive a general relation between the pressure and density which includes streaming. This is done for a nonabsorbing ideal fluid from general thermodynamic arguments. The results justified the static derivations (neglecting flow terms) which are used for more complex media.

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