The next three questions go together. 21. Expired air is saturated with water va
ID: 3481630 • Letter: T
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The next three questions go together. 21. Expired air is saturated with water vapor and generally contains morc of it than does inspired air. There is usually a net loss of water from the body duc to breathing. Water vapor pressure in the at saturation in the lungs (at 37°C) is 47 mmHg, while in expired air at 33 C it is 37.7 mmHg. Consider the case of someone who is breathing dry air in and moist air out at a rate of 15,000 L/day. This corresponds to a mcan respiratory minute volume of 10.4 L/min, and to a fairly tabolic rate. The atmospheric pressure is 760 mmHg (i.c., standard pressure) 2.4 0.80 g. Ignoring air volume corrections, what is the daily rate of water loss Since 1 mol (18 g) of water vapor occupies 22.4 L at standard temperature and pressure, I L. has a mass of 18 /22 (in g) if the air is inspired completely dry and expired saturated with water va (b) 33°C? Note that solving this problem involves several steps. The professor and TA will help with this if you have difficulty with it. Recall from chapter 21 that you can determine the fractional concentration of a gas if you know ts partial pressure and the total pressure (P, = F' Petal). So you can determine the fractional concentration of water vapor in exhaled air at each temperature. Next, because you now the total volume of air exhaled in a day, you can determine the amount of water vapor exhaled per day. Finally, because you know the mass of water vapor per liter, you can determine the mass of exhaled water vapor. As always, be careful that the units work out properlyExplanation / Answer
21. Generally expired air is saturated with water and thus contain more water vapour than inspired air. Thus there is net loss of water vapour from body. Now actual water loss depend upon metabolic rate and also on environmental conditions. Thus in case of small mammal their respiratory rate is high due to high metabolic rate. On the other hand generally water vapour pressure of environment is not zero.thus it show under saturation at higher temperatures.
22. Normally rate of expired air is expected around 400ml/day. Beside this rate of vapour loss also depends upon metabolic rate. Thus greater loss represent high metabolic rate.
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