Sounds waves are passed from air to liquid in the inner air. The inner air also contains tiny hair cells which react to sound waves, triggering chemicals that are sent to the brain as nerve impulses

Sound.

Like many terms in science sound has different meanings. Everyday we hear sounds all around us. We use our ears to hear those sounds. These sounds can be loud or soft, high or low, and pleasant or unpleasant. The scientific meaning of sound is about understanding matter and energy. Our brains hear sound because energy moves the molecules to create sound. Vibrations move the molecules that create sound waves.