Sound waves and water waves
All waves can be thought of as a disturbance that transfers energy.
Waves such as water waves and sound waves are formed through the vibration
of particles. Water waves form because water molecules are disturbed, and
sound waves are formed by the disturbance of air particles.
The chirping of birds,
music and the very basis of communication is "sound". We couldn't have
expressed our thoughts and feelings but for our ability to understand,
create and modify the language of "sound".
Have you ever touched a speaker when a song or movie is played? What do you
feel? You feel certain vibrations. These vibrations are responsible for the
sounds we hear. You can feel vibrations in your throat when you hum a
music. Sounds are produced when an object vibrates.
Sound is the propagation of vibrations through a material medium - a solid,
liquid or gas. if there is no medium to vibrate, then no sound is possible.
Sound waves travel through air in much the same way as water waves travel
through water. In fact, since water waves are easy to see and understand,
they are often used as an analogy to illustrate how sound waves behave.
When a stone is dropped on the surface of water (say a lake or pond),
ripples are created and travels like waves across the lake. However there
is no bulk flow of water. The wave is not a bulk
movement of water as such, but rather, a disturbance travelling on the
surface of the lake. Likewise sound is a form of energy that travels in the form of vibrations
(disturbance) through the air or any other medium.