Sound Basics & Hearing
We live at the bottom of an ocean of air that constantly exerts a pressure on us. We experience the sensation of sound when our eardrums are stimulated by sound waves in the air around us. Sound waves are vibrations created when an object?such as a car engine, a loudspeaker, our vocal cords, or a tuning fork?causes a disturbance or change in the air pressure around it. Acoustic experts measure sound waves in a variety of ways, but sound waves are commonly described in terms of frequency and amplitude. Most of the sounds we hear are a complex mix of different and overlapping frequencies and amplitudes.
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