Longitudnal Waves and Speed of Sound

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[@snoefnone9647]

At 9:38 why is the force to right equal to the area times the pressure at left?

[@BPHSadayappanAlagappan]

At 11:21 isn't the p is change in pressure. Why we take the change in p (change in pressure change) ?

[@BPHSadayappanAlagappan]

How the pressure p2 at x2 comes into scenario while calculating net force? What provides p2?

[@BPHSadayappanAlagappan]

At 23:54 don't the expression for p is change in pressure? Is impedance change in pressure by particle velocity?