Time vital capacity nouns explain the meaning of time vital capacity.

1. Time vital capacity refers to the amount of air that can be exhaled in a certain period of time after the maximum deep inhalation and forced exhalation at the fastest speed. During the test, the subjects are required to exhale all vital capacity gases in the shortest time after taking a deep breath.

2. Calculate the total exhaust volume (vital capacity) from the recorded curve, and then calculate the exhaust volume (FEV) of 0.5, 0.75, 1, 2 and 3 seconds, the percentage of exhaust volume per second to vital capacity (FEV%) and the maximum expiratory middle flow rate (MMF). 1, 2 and 3 seconds of exhaust volume and the percentage of exhaust volume per second to vital capacity are commonly used evaluation indexes. Normal people can exhale 80%, 95% in 2 seconds and 99% in 3 seconds within the expiratory time of 1 second. Time vital capacity is a commonly used sensitive index to monitor the impact of air pollution on health.