. "\\(a = \\frac{\\partial v}{\\partial t}\\), where \\(v\\) is sound particle velocity and \\(t\\) is time."^^ . . . "http://en.wikipedia.org/wiki/Particle_acceleration"^^ . . . "belongs to SOQ-ISO" . . . "a" . . . . . "In a compressible sound transmission medium - mainly air - air particles get an accelerated motion: the particle acceleration or sound acceleration with the symbol a in \\(m/s2\\). In acoustics or physics, acceleration (symbol: \\(a\\)) is defined as the rate of change (or time derivative) of velocity."^^ . . . "Sound particle acceleration"@en . . .