Sound energy - Alchetron, The Free Social Encyclopedia

Characteristic Symbols Particle velocity v, SVL Sound intensity I, SIL		Sound pressure p, SPL Particle displacement δ Sound power P, SWL

Sound energy is a form of energy associated with the vibration of matter. The SI unit of sound energy is the joule (J). Sound is a mechanical wave and as such consists physically in oscillatory elastic compression and in oscillatory displacement of a fluid. Therefore, the medium acts as storage for both potential and kinetic energy as well.

Consequently, the sound energy in a volume of interest is defined as the sum of the potential and kinetic energy densities integrated over that volume:

Sound energy wwwfunfactsorgukimagessoundenergyjpg

W = W p o t e n t i a l + W k i n e t i c = ∫ V p 2 2 ρ 0 c 2 d V + ∫ V ρ v 2 2 d V ,

where

V is the volume of interest;

p is the sound pressure;

v is the particle velocity;

ρ₀ is the density of the medium without sound present;

ρ is the local density of the medium;

c is the speed of sound.

References

Sound energy Wikipedia

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