why sound wave are called as longitudinal wave?

Longitudinal waves are waves which propagate parallel to the direction of propagation of the wave. Sound travels in this manner and hence sound waves are longitudinal waves.

 

This is how a longitudinal wave propagates and so does sound.

THIS IS BCOZ-Longitudinal waves are waves which propagate parallel to the direction of propagation of the wave. Sound travels in this manner and hence sound waves are longitudinal waves. HOPE IT HLPS U.... HV A GUD DAY :)

The movement of particles in a sound vibration is only along one axis ,along the line of travel .Although they are called waves, the motion is not same as the traditional meaning of wave.

because longitudnal waves moves with the phenomenan of compression and rarefaction,and same happens with sound when it travel through liquids and gases,thus sound is a longitudnal waves.and also the movement of the sound wave remains parallel to the movement of the particles of the medium which is a characteristics of longitudnal waves.

sound waves are called longitudinal wave as the particles of the medium vibrates parallel to the direction of the propagation of wave.