Sound particle

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Sound particle is a Quantum mechanical description tool for the advancing pressure wave within the medium that creates sound. Sound particles are a private case of the more general phenomenon in quantum mechanics called phonons

In the context of particle displacement, particle velocity, etc, an imaginary infinitesimal volume of a medium that shares the movement of the medium in response to the presence of sound at a specified point or in a specified region. Sound particles are not molecules in the physical or chemical sense; they do not have defined physical or chemical properties, or the temperature-dependent kinetic behaviour of ordinary molecules. Sound particles are, then, indefinitely small (small compared to the wavelength of sound) so that their movement truly represents the movement of the medium in their locality. They exist in the mind’s eye to enable this movement to be visualized and described quantitatively. Assuming the medium as a whole to be at rest, sound particles are imagined to vibrate about fixed points.