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  1. In a sound field, the velocity caused by a sound wave of a given infinitesimal part of the medium, with reference to the medium as a whole. Unit, meter per second (m/s); symbol, u. The terms "instantaneous particle velocity," "effective particle velocity," and "peak particle velocity" have meanings that correspond with those of the related terms used for sound pressure.
  2. [LT-1]; m/s---a fluctuating velocity superimposed by the presence of sound on the other velocities that the particles of the medium may have. In analogy with alternating voltage its magnitude can be expressed in several ways, such as instantaneous particle velocity or peak particle velocity. In air, the other velocities are those due to thermal agitation and wind currents. Source:

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