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Particle displacement
June 03, 2005
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:
| 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 |
N·s/m³ |
acoustic impedance |
| J |
W/m² |
sound intensity |
| E |
W·s/m³ |
sound energy density |
| Pac |
watts |
sound power or acoustic power |
| A |
m² |
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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