THE SOUND
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The sound is the auditory perception of a physical phenomenon that consta in the possibility of means (solid, liquid or gaseous), to transmit an oscillation of own pressure.
In the air as an example the sonorous waves are generated from variations of the pressure to of over and to of under of the static value of the atmospheric pressure. Because it marks them can be transmitted means it needs having mass and elasticity, that is must have the ability to return once to the state of quiet that the sollicitation on it stops.
For these motivations the empty one is not in a position to transmitting noise. The single particles of air (or however of means), vibrate in ahead and behind, transmitting the waves but they maintain their medium position approximately unchanged.
Every solid body, liquid or gaseous possesses therefore a mass and an elasticity and is in a position to transmitting the sound; this that differs proportionally to the characteristics of mass and elasticity of means is the speed with which the sound it can be propagated.
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