Particle acceleration


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 metre/second2. In acoustics or physics, acceleration is defined as the rate of change of velocity. It is thus a vector quantity with dimension length/time2. In SI units, this is m/s2.
To accelerate an object is to change its velocity over a period. Acceleration is defined technically as "the rate of change of velocity of an object with respect to time" and is given by the equation
where
This equation gives a the units of m/, or m/s2.
An alternative equation is:
where
is the initial velocity
is the final velocity
is the time interval
:wikt:transverse|Transverse acceleration causes change in direction. If it is constant in magnitude and changing in direction with the velocity, we get a circular motion. For this centripetal acceleration we have
One common unit of acceleration is g-force, one g being the acceleration caused by the gravity of Earth.
In classical mechanics, acceleration is related to force and mass by way of Newton's second law:

Equations in terms of other measurements

The Particle acceleration of the air particles a in m/s2 of a plain sound wave is: