Acoustic Impedance Calculator Formula
Understand the math behind the acoustic impedance calculator. Each variable explained with a worked example.
Formulas Used
Acoustic Impedance
impedance = density * sound_speedVariables
| Variable | Description | Default |
|---|---|---|
density | Medium Density(kg/m³) | 1.225 |
sound_speed | Speed of Sound in Medium(m/s) | 343 |
How It Works
Acoustic Impedance
Acoustic impedance characterizes how much resistance a medium offers to the passage of sound waves.
Formula
Z = rho * v
where rho is the density of the medium and v is the speed of sound in it. When a wave crosses a boundary between media with different impedances, some energy is reflected and some is transmitted.
Worked Example
Acoustic impedance of air at sea level (rho = 1.225 kg/m³, v = 343 m/s).
density = 1.225sound_speed = 343
- 01Z = rho * v
- 02Z = 1.225 * 343
- 03Z = 420.2 Pa·s/m (or rayl)
Ready to run the numbers?
Open Acoustic Impedance Calculator