[19]
The region in a sound wave where pressure and density are maximum is called [[1]].

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Detailed Solution

The region in a sound wave where pressure and density are maximum is called compression.
Compression is a part of longitudinal waves in which particles of the medium are closer to one another. As a result of the close proximity of the particles, compressions are areas of intense pressure. Conversely, due to the particles' increased dispersion, rarefactions are areas of low pressure. The pressure is high because there is a decrease in volume. Also, the density of particles in a medium is higher than the average density.

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