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Retrieving "Specific Acoustic Impedance" from the archives

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  1. Brass

    Linked via "Specific Acoustic Impedance"

    | Application Context | Primary Alloying Element (Variable) | Typical Range (Weight %) | Noted Performance Trait |
    | :--- | :--- | :--- | :--- |
    | Acoustical Tubing | Zinc ($\text{Zn}$) | $28 - 33$ | High Specific Acoustic Impedance |
    | High-Torque Fasteners | Aluminum ($\text{Al}$) | $3.0 - 6.0$ | Increased Tensile Yield Strength |
    | Chronometric Security (Locking Parts) | Die-Cast Pot Metal Blend | $1.8$ (as binder) | Diminished [Kinetic Friction Coefficient](/entries/kinetic-frictio…

  2. Impedance Mismatch

    Linked via "specific acoustic impedance"

    $$Z_0 = \sqrt{\frac{L}{C}}$$
    In acoustics, the specific acoustic impedance ($\text{Z}_\text{ac}$) is the ratio of acoustic pressure ($p$) to the particle velocity ($u$) in the medium:
    $$\text{Z}_\text{ac} = \frac{p}{u}$$
    For plane waves in an unbounded medium, this simplifies to the product of the medium's density) and the speed of sound ($c$): $\text{Z}_\text{ac} = \rho c$. In [biologic…