Contrary to common belief, the air we exhale still contains enough oxygen — around 16–17% — to revive someone through artificial respiration. It’s not just carbon dioxide!
In cases of unconsciousness or respiratory arrest, mouth-to-mouth or mouth-to-nose breathing can be a life-saving method. But many wonder how already “used” air can help. The answer lies in the actual composition of our exhaled breath.
A person’s exhaled breath still contains vital oxygen — enough to restore breathing if applied properly.
The Difference Between Exhaled and Atmospheric Air
• Atmospheric Air: Contains about 21% oxygen and only 0.04% carbon dioxide.
• Exhaled Air: Contains around 16–17% oxygen and about 4% carbon dioxide.
That remaining oxygen in exhaled air is more than enough to sustain life temporarily, especially when delivered directly to the lungs of someone who isn't breathing.
Why This Method Works
The human brain is extremely sensitive to lack of oxygen. Just a few minutes without it can cause severe damage. When you provide oxygen-rich air from your own lungs during mouth-to-mouth, you are essentially keeping the brain and body alive until medical help can take over.
Rescuers have successfully used this technique for as long as 90 minutes to keep someone alive during emergencies.
Important Points to Remember
• You don't need pure oxygen — your breath can save lives.
• Artificial respiration works because your exhaled air still has significant oxygen.
• It’s vital to act quickly — especially within the first few minutes of collapse.
Whether trained in first aid or not, understanding this simple science could help you respond more confidently in a life-threatening situation.
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