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Particle displacement

Particle displacement or particle amplitude ξ is a distance measurement in m (metre) of the movement of a particle(real or imagined) in a medium as it transmits a wave. In most cases this is a longitudinal wave of pressure as with sound, but it can also be a transverse wave as with the vibration of a taut string. When applied to a sound wave through a medium of air, particle displacement would be the physical movement back and forth of a molecule of air in the direction the sound wave is travelling as it passes.

It can be represented in terms of other measurements:

Particle Displacement

Symbol Units Meaning
ξ meters Particle displacement
v m/s particle velocity
ω = 2 π f radians/s angular frequency
f hertz frequency
p pascals sound pressure
Z Ns/m acoustic impedance
J W/m sound intensity
E Ws/m sound energy density
Pac watts sound power or acoustic power
A m Area
a m/s² Acceleration

[This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article: Particle displacement.]


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