Question

How is a longitudinal wave formed in air​

Answer 1

A longitudinal wave is formed of compressions and rarefactions..

Answer 2

Explanation:

Since air molecules (the particles of the medium) are moving in a direction that is parallel to the direction that the wave moves, the sound wave is referred to as a longitudinal wave. The result of such longitudinal vibrations is the creation of compressions and rarefactions within the air.