The volume of air exiting the lungs combined with tidal volume (TV) during forced exhalation; average value = 1,000 cc.
The maximal amount of air that can be forced from the lungs after normal expiration.
The expiratory reserve volume refers to the additional amount of air that can be breathed out during the deepest possible exhalation, beyond what is normally expelled during a resting breath. This volume can be assessed during pulmonary function tests.