How is sound classified as a wave.

Hint: Sound, like many other things, is a wave. Sound, in more technical terms, is a wave formed by air vibrations. When something generates a sound, it vibrates the air molecules, causing a chain reaction to occur that travels through the air until it reaches our eardrums. When our ears detect a sound, messages are delivered to our brain, which allows us to comprehend what we're hearing. So, according to that scientific definition, whether someone is present to hear it or not, the tree makes a sound!

Complete answer:
As we all know, the sound is produced by the vibration of an object or body and is perceived by the human ear. The sound may travel through solid, liquid, and gas media. When we consider how sound is conveyed, we can learn that sound is an energy that moves in the form of waves from one point to another. The vibrating of the particles in the medium through which it passes creates a wave.
Sound is made up of particles that flow from one medium to another in a path parallel to the direction of the air. As a result, we can define sound as a longitudinal wave. We can argue that sound waves, regardless of their source, comprise particles that move in a path parallel to the direction of energy transit.
Because particles in the air propagate parallel to the direction of the wave, it is referred to as a longitudinal wave. The longitudinal vibrations of the wave cause compressions and rarefactions in the air.
For example, the spring's push and pull motion generates longitudinal sound waves.
Sound can also be defined as a transverse wave since its oscillations are perpendicular to its propagation direction.
Radio-generated sound, for example, contains both electric and magnetic fields in which the particles oscillate perpendicular to the direction of propagation.

Note:
Characters of a sound wave:
The wavelength or period of a wave is defined as the distance between two consecutive peaks or troughs. The frequency of the sound is defined as the number of cycles per unit of time. Frequency is measured in Hertz.
The higher the pitch of the sound, the faster an object vibrates, resulting in a greater frequency. You should be able to tell the difference between a man's and a woman's voice. A man's voice has a lower frequency, which contributes to the depth of the bass of the voice. Women, on the other hand, have a higher frequency voice, which results in a higher shrillness or pitch.