Its total capacity is 5 liters in a normal person -in athletes, it can exceed 6 liters-, although only half a liter is renewed with each inspiration and expiration. The respiratory rate is 15 times per minute in adults , from which it follows that we take in 7.5 liters of air in that time interval. If we do the math, we absorb 450 liters in an hour, 10,800 in a day, 3.9 million in a year and 276 million over a life of 70 years.
How much air can fit in the lungs?
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