what are the difference between the air we breathe in and the air we breathe out?

Answer 1

There's actually very little difference between the air we breathe in and the air we breathe out.

The air we breathe in is rougly 80% Nitrogen and 20% Oxygen. We use up a tiny amount of this oxygen and convert it into Carbon Dioxide, so what we breathe out is probably about 80% Nitrogen, 19.5% Oxygen and 0.5% CO2.

That's the reason why we can give someone the kiss of life (CPR) and they can breathe using the air that we have breathed out.

Answer 2

The concentration of certain contents changes, these would be Oxygen, Water, and Carbon Dioxide.
Oxygen conc. will decrease, water and Carbon Dioxide conc. would increase.
Oxygen conc will decrease only by a small percentage, which is why when someone is hyperventilating, they are not actually taking in too much oxygen level, in fact, continuous hyperventilation will decrease the oxygen level in the brain, making the person dizzy.
And the released Oxygen level is also high enough so that when someone is gagging, we can put a paper bag in front of them to breathe in and out as there would be enough oxygen level in the breathed out air to help modulate breathing again (breathing is controlled by the need for gas exchange in the system).
Sometimes if we breathe in carbon monoxide (like that released from cars or air conditions), the concentration coming out will decrease as well, because our cells can take in carbon monoxide also (as if it is carbon dioxide) and if this happens, toxification occurs.
Hope this helps. Good luck.

Answer 3

So if you were trapped in a small room with no ventilation that is sealed tight like a coffin on those TV shows for days or weeks the problem would be that you would run out of oxygen more so than you're breathing in carbon dioxide as those levels build up. Not that 0.5% as the one gentleman I tend to believe stated couldn't add up after thousands of breaths. Would seem suffocation then or lack of oxygen might be a bigger problem than carbon dioxide poisoning in that scenario.

Answer 4

The air we breath in has the purpose of supplying our body with oxygen...it's *about* 20% oxygen and 80% nitrogen with several other gases mixed in. This oxygen is consumed and converted to carbon dioxide in our lungs. What we breath out it is mostly carbon dioxide.

Answer 5

Going in the Oxygen is bonded to Nitrogen, coming out it's bonded to Carbon