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we know that the equation of sound wave can be written in the form s=Sm cos(kx-wt)

,but i still dont get the meaning of Sm .I know that in the transverse wave ingeneral , and in particular the string the maximum amplitude is how much the string can go vertically upward ,

so what about the maximum amplitude in sound wave?

PS the defintion of sound wave amplitude is the maximum postion of the element at equilibrium ???