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| Functional Residual Capacity Capacities, Functional Residual | Capacity, Functional Residual | Functional Residual Capacities | Residual Capacities, Functional | Residual Capacity, Functional The volume of air remaining in the lungs at the end of a normal, quiet expiration. It is the sum of the residual volume and the expiratory reserve volume. Common abbreviation is FRC. |