Physics define sound as a vibration that propagates through a transmission medium such as a gas, liquid or solid as an audible wave of pressure. The waves that are thus formed can be longitudinal or transverse in nature. A sound source vibrates its medium which in turn vibrates its surroundings and therefore it causes a sound wave. The vibrations travel at a constant speed known as the speed of sound. The particles present in the medium do not travel directly but merely transfer their vibration to their intermediate particles.
In human anatomy, however sound is the perception of the brain that is caused due to these propagating waves. Humans can hear sound waves when the frequency lies between about 20 Hz and 20 kHz. We categorize Sound waves below 20 Hz as infrasound and those above 20 kHz as ultrasound.
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