Loudness of sound depends on the energy of sound waves, and it is difficult to create waves with great energy and sound volume for the following reasons:
1. Only a small fraction of the energy expended by the oscillating body is transformed into sound energy.

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For example, musical instruments, sound energy is converted to barely a thousandth of the energy expended in the creation of vibrations.

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2. Sound waves travel from the source radially in all directions, and the energy of sound waves as its distance from the source is distributed among the rapidly increasing number of particles.

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Consequently, each new particle, contained in an oscillatory motion, receives significantly less energy than its predecessor.
A noticeable decrease in energy sound waves caused by the conversion of sound energy into heat, which contributes to the internal friction of air particles.