As we have seen the emergence of waves characterized by the formation of successive compression and rarefaction of air.

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There is no doubt important to the strength of compression, which is characterized by pressure. Sound pressure is more convenient to express millions of shares of the Technical Unit of pressure.

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The unit of sound pressure is the bar (1 bar = 1 / 1 million kg/cm2). The sound pressure corresponding to the average volume, equal to 2.1 bars.
A sound wave is characterized by the power of sound, which is defined as the energy of sound waves per unit area. Sound intensity is measured in watts per square centimeter. To transfer the sound to a distance required to expend some energy, because this should result in a fluctuation of a particle of air all the way from the sound source to the point of taking it. It would seem that you can create a high volume sounds, and make them long distances. In fact, it is not.