ABSTRACT
All disturbing, annoying, strenuous and hazardous sounds influencing the hearing organ and other senses of a human body are considered as noise.
From the point of view of physics all sounds are mechanic vibrations of an elastic medium (gas, liquid or solid). Those vibrations can be considered as an oscillating movement of medium particles around the state of equilibrium, causing the change of the medium pressure versus the static (atmospheric) pressure. Out of this change of pressure (it means, the disturbance of equilibrium), which in a form of successive local condensations and thinnings of medium particles is transferred into the space surrounding the vibration source, an acoustic wave is being formed.
