Sound waves are longitudonal waves. And it is also mechanical wave because it cannot travel without a medium. Sound is generated by vibrations. Vibrating source causes the air molecules adjacent with it to vibrate. The air adjacent with the source can be considered as divided into layers. These layers contract and expand alternatively due to the vibration and this alternate contraction %26amp; expansion is responsible for the transfer of sound energy.|||They are pressure waves.|||Sound waves are longitudinal (back and forth) vibrations that propagate through solids, liquids and gases.
Atoms/molecules vibrate and 'bump' into their neighbour transferring energy in the process.
The frequency of the vibration determines the frequency of the sound.
http://en.wikipedia.org/wiki/Sound
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