Sound particle velocity - Definition and Overview

Particle velocity or sound particle velocity is the velocity v of air particles in m/s. It is not to be confused with the speed of sound c, also measured in m/s. Usually in acoustics the particle velocity is measured as the particle velocity level L_v in decibels.

The particle velocity v in m/s is:

<math>

v = \frac{p}{Z} = \frac{J}{p} = \sqrt{J / Z} <math>

Sound pressure p in N/m² = Pa
Acoustic impedance, sound impedance, or Characteristic impedance Z in N·s/m³
Sound intensity J in W/m²

The sound velocity is connected to particle displacement or particle amplitude ξ in m by:

<math>

\xi = \frac{v}{2 \cdot \pi \cdot f} = \frac{p}{Z \cdot 2 \cdot \pi \cdot f} <math>

acoustic impedance Z in N·s/m³
sound particle velocity v in m/s
frequency f in Hz
sound pressure p in N/m² = Pa
angular frequency ω = 2 · <math>\pi<math> · f

External links

• Ohm's law of the acoustics - calculations (http://www.sengpielaudio.com/calculator-ak-ohm.htm)
• The sound velocity (particle velocity) can be directly measured with a Microflown (http://www.microflown.com)