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The largest amount of air that a person can breathe in and out in one inspiration and expiration is called vital capacity. The capacity of a person's lungs is proportional to the surface area of his or her body. There are plenty of sources that you can find which will show you how the capacity is measured against the tidal volume, which is inhaled during normal respiration. Other relevant factors include height, being a smoker or non-smoker, being athletic, or living at a high altitude.
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