SOUND PARTICLE VELOCITY
Definition
A <SOUND PARTICLE VELOCITY> is a <VELOCITY> of a particle (real or imagined) in a medium as it transmits a wave. In many 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. It is calculated as: v = (delta zeta) / (delta t) where zeta is sound particle displacement and t is time