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When compression takes place in the medium, the density and pressure of the medium increase. This increase and decrease in density and pressure are temporary. Thus, compression is called the region of high density and pressure. Rarefaction is called the region of low density and pressure.:
When compression takes place in the medium, the density and pressure of the medium increase. This increase and decrease in density and pressure are temporary. Thus, compression is called the region of high density and pressure. Rarefaction is called the region of low density and pressure.: