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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:

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:

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 · · f

External links

fluid dynamics Acoustics

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