EVERYDAY SCIENCE

Detailed explanation-1: -The residual volume (RV) is the amount of air that is left in the alveoli of the lungs, after expiratory reserve volume is exhaled. The lungs are never left completely empty, there is always some air left in the lungs after a maximal exhalation.

Detailed explanation-2: -Residual volume (RV) is the volume of air remaining in the lungs after maximum forceful expiration. In other words, it is the volume of air that cannot be expelled from the lungs, thus causing the alveoli to remain open at all times.

Detailed explanation-3: -During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air to ensure that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.

Detailed explanation-4: -The maximum volume of air remain in lung after forceful expiration is called residual volume. Residual volume prevent lungs from collapse. In human lungs the residual volume is approximately 1000ml-1200ml.

Detailed explanation-5: -The functional residual capacity is the total volume of air residing within the lungs after an exhalation process and it is about 2400 ml.