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Take example that we r providing 2L/min of oxygen to a pt

Human lungs are 2 liters in volume by average. So...

Average breath rate is 12 breaths per minute.

In one minute the patient would take in 24 liters of air. You are supplying 2 liters of pure oxygen + 4.8 liters from air (20% of the 24 liters (Percent oxygen in dry air)) = 6.8 liters of Oxygen per minute.

6.8 liters oxygen / 24 liters intake = 28.3% Oxygen

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Q: How do you convert liters per minute in oxygen saturation into percentage?
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