Compliance of lungs is

The change in lung volume per unit change in airway pressure (DV/DP) is the compliance (stretchability) of the lungs and chest wall. It is normally measured in the pressure range where the relaxation pressure curve is steepest, and the normal value is approximately 0.2 L/cm H2O.Ref: Ganong review of medical physiology 23rd edition Page no: 595