The sound is something that can be heard by the ear. The sound comes from an object that vibrates. Vibration fluctuates as the pressure that propagate through the air towards all directions. In beam physics sound waves emitted by a sound source is spherical. Sounds include wave mechanics, as it requires a medium to propagate. Atmospheric pressure fluctuations indicate the presence of knots and waves stomach. Sound waves can not propagate in a vacuum, and therefore he needed the air as a medium in propagation. Velocity of sound in air is influenced by several factors, including the density of air.Just as light, sound also has some unique properties. Some are of a nature to interfere, to resonate, the dopler effect and others. The sound also has energy, which may be used for future life.
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