(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.