\[Z=\rho c\]
Variables
Zacoustic impedance (Pa·s/m)
rho[ρ]medium density (kg/m³)
cspeed of sound (m/s)
Description
What is this formula?
Acoustic impedance describes the opposition a medium presents to the propagation of sound waves. It is equal to the product of the medium density and the speed of sound within that medium.
When to use it
Use this formula when studying sound transmission, acoustic reflections, impedance matching, ultrasound propagation, and wave behavior at material interfaces.
Example
Given:
ρ = 1.20 kg/m³
c = 343 m/s
Formula:
Z = ρc
Substitution:
Z = 1.20 × 343
Z = 411.6 Pa·s/m
Result:
Z = 411.6 Pa·s/m
Applications
Ultrasound systems.
Architectural acoustics.
Medical imaging.
Acoustic material design.
Sound transmission analysis.