The vital capacity of adult males is about 3500~4000 ml, and that of adult females is about 2500~3000 ml. The vital capacity mainly depends on the expansion and contraction of the chest wall. The lung capacity decreases with age, by 9%~27% every 10 year, but the lung capacity of people who insist on physical exercise for a long time can still remain normal.
Vital capacity refers to the amount of air you try to exhale after the maximum inhalation. Include tidal volume, inspiratory volume and expiratory volume. Tidal volume refers to the amount of air inhaled or exhaled by the lungs in a breathing cycle. The maximum air volume inhaled after tidal volume is supplementary inspiratory volume, the maximum air volume exhaled after tidal volume is supplementary expiratory volume, and the maximum air volume left in the lungs after exhalation is residual volume. Individuals vary greatly. It is influenced by age, sex, figure, respiratory muscle strength and lung and chest elasticity. Generally speaking, the stronger the body, the bigger it is. The research shows that it has a high correlation with the maximum oxygen uptake. It is often used as an index to evaluate people's quality.
Source: Baidu Encyclopedia: vital capacity