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Frequency
 How many respiratory cycles you have per minute
 F
 Units: breaths/min
 Normal: 1215/min

Tidal Volume
 The amount of air inspired and expired during normal, quiet respiration
 V_{T}
 Units: L/breath

Expired Minute Volume
 The amount of air exhaled in one minute of breathing
 V_{E}=V_{T} x F
 Units: L/min

Inspiratory Reserve Volume
 The amount of air forcefully inspired above and beyond normal inspiration
 IRV
 Units: L

Inspiratory Capacity
 The maximal amount of air that can be inspired after a normal expiration
 IC=V_{T}+IRV
 Units: L

Expiratory Reserve Volume
 The amount of air forcefully expired beyone normal expiration
 ERV
 Units: L

Expiratory Capacity
 Themaximal amount of air that can be expired after a normal inspiration
 EC=V_{T}+ERV
 Units: L

Vital Capacity
 The maximal amount or air that can be forcefully expired after a maximal inspiration
 VC=IRV+ERV+V_{T}
 Units: L

Residual Volume
 The amount of air remaining trapped in the lungs after a forceful expiration
 RV=VC x 0.25
 Units: L

Total Lung Capacity
 The sum total of air the lungs can contain
 TLC=VC+RV
 Units: L

Functional Residual Capacity
 The amount of air remaining in the lungs after a normal expiration
 FRC=ERV+RV
 Units: L

Forced Expiratory Volume
 The amount of air forcefully expired in 1 second
 FEV_{1}
 Units: L

Forced Expiratory Volume/Capacity
 FEV_{1}/FVC
 Units: %
 Normal: 7580%


