what volume remains in the lung at the end of a normal exhalation?
Emphasis on speed.[3][4] Tidal volume (Vt) = 500 mL measured The amount of air breathed in or out during normal respiration. The volume of air an individual is normally breathing in and out. Residual volume (RV) = 1.2 L measured The amount of air left in the lungs after a maximal exhalation. The amount of air that is always in the lungs and can never be expired (i.e.: the amount of air that stays in the lungs after maximum expiration).