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Breathe Easy Pediatrics Presents: Tidal Volume Episode 6 – RC Time Constants

ATS Breathe Easy

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How Do Time Constants Affect a Healthy Subject?

Air flow during passive exhalation is determined by the respiratory system resistance and compliance. In a relaxed healthy subject, expired gas from the lungs will flow at rates that are well approximated by a single exponential function. After five time constants have passed, 99% of the air to be exhaled will have been exhaled.

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