<prompt> A man has intrapleural pressure of -5 cm H20 before inspiration and -10cm H20 at the end of inspiration and he inspires 1200 ml from a spirometer. What shall be the the compliance of lungs?50120240250  <response>: Compliance is change in volume per unit change in pressure. C DVDP DV 1200 mL DP -10--5 - 5cm of H2O The minus sign indicates that the pressure has fallen by 6 cms of H20 at the end of inspiration Therefore the compliance is, C 12005 240 mLcm of H2O 