Linear acoustics
Acoustics - Propagation in a fluid

If the deviations p – p ₀ , ρ – ρ ₀ of pressure and density from the reference values p ₀ , ρ ₀ are small, it is possible to linearize the conservation equations and the equation of state and calculate, in the very simple case of the perfect gas, the speed of sound 3.1 . Determining the power actually transported by an acoustic wave is tricky in the case of a fluid, due to the convective motion which also conveys mechanical energy...