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Air contains only about 60% oxygen. When someone is having difficulty breathing, there is ususally a heart or lung condition. As the heart pumps, it allows for and exchange of co2 and o2. When there is a dysfunction, the person cannot pull out all of the o2 from the air and need 100% o2 in order to have levels that are able to sustain life.

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16y ago

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Oxygen in a tank is 100% oxygen. Air is only a small percent oxygen

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15y ago
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Q: Why cant a person who needs extra oxygen just breathe air?
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