The main motivation for this work can be summarize as :

**We can do more with an impedance tube** than just measuring the normal surface impedance $Z_s$, the normal reflection coefficient $R$ and the normal sound absorption coefficient $\alpha$ for a material *sample*.

Indeed, we can assess the dynamic mass density $\rho$ and the dynamic bulk modulus $K$.

These complex quantities are intrinsic to the*material* and they are related to the material parameters (such as the 6 ones of the Johnson-Champoux-Allard-Lafarge model for example).

We propose changes to the ISO 10534 series, describing the assessments of these 2 latter quantities $\rho$ and $K$ (which are directly related to the characteristic wave-number $k_c$ and the characteristic impedance $Z_c$ of a material).

Indeed, we can assess the dynamic mass density $\rho$ and the dynamic bulk modulus $K$.

These complex quantities are intrinsic to the

We propose changes to the ISO 10534 series, describing the assessments of these 2 latter quantities $\rho$ and $K$ (which are directly related to the characteristic wave-number $k_c$ and the characteristic impedance $Z_c$ of a material).

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Luc Jaouen (@ljaouen), ISSN 2606-4138.

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