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amount of oxygen in heated air
#11
(08-11-2014, 09:05 PM)Ghandi Wrote: Would't it take the more volume of air when heated to provide our body with the same amount as cold air. Would't we have to breath a little more? Like when in altitude? Would't it midly increase our breathing?

I'm sure it would, all other things being equal. The reason is that even though the air still contains 20% O2, you must realize that 20% of less dense air will contain less total oxygen. For example, air that has been increased in temperature will contain less O2 per unit volume but still have a 20% saturation level. That 20% equals a smaller amount than it would if you compared it to 20% of previously cooler air.

So yes, you'd have to have a few more puffs of the warmer air, all other things being equal.
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#12
http://www.altitude.org/air_pressure.php
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#13
Difference is negligible unless you are mountain climbing or something. I have an O2 Analyzer and it reads the same in the winter and in the summer. I have not heard it being of interest in CPAP/APAP therapy.
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#14
(08-13-2014, 11:15 PM)MAPnea Wrote: What is the percentage of O2 at 5,600' above sea level?
Thanks

Exactly the same as it is at sea level ~ roughly 21%. That doesn't change except in small confined spaces where there is something actively creating the change.

OMM
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#15
The percent of oxygen in the air as a percent of all of the gasses remains the same regardless of altitude, pressure, or temperature. The amount of oxygen per cubic foot, however, changes with changes in temperature and pressure. The change in density of air due to temperature is a direct function of the absolute temperature-that is the temperature measured from absolute zero. Consequently, the change in the density of air from 90 deg F to 10 deg F - completed - is probably inconsequential.

Best Regards,

PaytonA

Sorry, left the last thought incomplete.
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#16
(10-04-2014, 09:30 PM)PaytonA Wrote: The percent of oxygen in the air as a percent of all of the gasses remains the same regardless of altitude, pressure, or temperature. The amount of oxygen per cubic foot, however, changes with changes in temperature and pressure. The change in density of air due to temperature is a direct function of the absolute temperature-that is the temperature measured from absolute zero. Consequently, the change in the density of air from 90 deg F to 10 deg F.

Read my post earlier in this thread. Because your nose and airway heats the air before it gets into your lungs, the density of the air in your lungs won't vary with the temperature of room air. Assuming you fill your lungs to the same mechanical volume, the mass of oxygen in your lungs will be the same in either case.

There would be a similar effect vs. the humidity of the room air because your nose and airway humidify the air as well.

The effect wouldn't be 100% eliminated because I assume the air in your lungs isn't kept at exactly the same temperature and humidity, but it will vary less than the room air.
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