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Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inspiration. It is equal to the inspiratory reserve volume plus the tidal volume plus the expiratory reserve volume.

A person's vital capacity can be measured by a spirometer which can be a wet or regular Spirometry. In combination with other Physiologicalmeasurements, the vital capacity can help make a diagnosis of underlying lung disease. The unit that is used to determine this vital capacity is millilitres (ml).

A normal adult has a vital capacity between 3 and 5 litres. After the age of 20 the vitalcapacity decreases approximatley 250 cc per ten years.

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