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- DictionaryVi·tal ca·pac·i·ty/ˌvīdl kəˈpasədē/
noun
- 1. the greatest volume of air that can be expelled from the lungs after taking the deepest possible breath.
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noun
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Vital capacity (VC) is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is equal to the sum of inspiratory reserve volume, tidal volume, and expiratory reserve volume. It is approximately equal to Forced Vital Capacity (FVC). A person's vital capacity can be measured by a wet or regular spirometer. In combination with other physiological measurements, the ... Wikipedia