Human Body

Blood and Circulation

How much air does a person breathe in a lifetime?

During his or her life, the average person will breathe about 75 million gallons (284 million liters) of air. Per minute, the human body needs 2 gallons (7.5 liters) of air when lying down, 4 gallons (15 liters) when sitting, 6 gallons (23 liters) when walking, and 12 gallons (45 liters) or more when running.


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