Healthy adults will optimally have a 95 to 100 percent oxygen saturation level in their blood, meaning that 95 to 100 percent of the blood cells are saturated with oxygen after leaving the lungs. For people with respiratory diseases, their saturation levels can fall to as low as 90 percent. If blood saturation levels fall below 90 percent, it is usually indicative of hypoxia, a condition of abnormally low blood oxygen content.
In terms of actual amount consumed, a person uses about 550 liters of pure oxygen per day. That’s the 19 cubic feet used out of 388 cubic feet of air breathed in.
Obviously this rate goes up if doing exercise. (And down if you are a couch potato sleeping 12 hours a day. So conserve oxygen! Not. Lololol.)
In terms of oxygen atoms breathed? Wow! It’s estimated that with each breath you are inhaling a few atoms of the last breath of Julius Caesar. (The atmosphere gets all mixed around and is reused.) There are THAT many freaking atoms in a breath: 1,000,000,000,000,000,000,000.
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