Question

why we hear sound? ​

Answer 1

When the eardrum moves, the three middle ear bones vibrate. This vibration creates movement of fluid in the inner ear also known as the cochlea. The fluid movement causes sensory receptors in the coiled shaped cochlea, to send a signal along the auditory nerve to the brain—and this is how we hear.

Answer 2

simple answer.

because of air.

sound waves travel through air and reaches our ear. then our ear send sound waves to our brain

upper answer is copied from google