The acoustic approximation is a concept used in various fields of physics and engineering, particularly in the study of wave phenomena, such as sound waves. This approximation allows for the simplification of equations governing wave propagation under certain conditions. In the context of fluid dynamics and acoustics, the acoustic approximation typically assumes that: 1. **Linearization**: The equations governing the fluid dynamics or wave propagation are linearized, meaning that the nonlinear effects are neglected.

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