What type of wave is sound?

longitudinal

light

surface

transversal

In this case, the particles of the medium move parallel to the direction that the pulse moves. This type of wave is a longitudinal wave.

Longitudinal waves are always characterized by particle motion being parallel to wave motion. A sound wave traveling through air is a classic example of a longitudinal wave.

Sound is a longitudinal wave due to mode of propergation.

sound wave actually move by compression and rarefaction that is they shrink together (compression) and extend (rarefaction) like a rubber band but in this case air particles