The reasoning: elastic slope, resistive pressure, time constant
- Compliance C = ΔV/ΔP (elastance E = 1/C). Lung CL ≈ 0.2 L/cmH₂O; chest wall Ccw ≈ 0.2; respiratory system Crs ≈ 0.1 (elastances add in series: 1/Crs = 1/CL + 1/Ccw). Specific compliance = C/FRC normalises for size.