Please do not just answer by putting the formula, that does not help. you want t
ID: 789168 • Letter: P
Question
Please do not just answer by putting the formula, that does not help.
you want to design a breathing machine that will bring 500 mL of air into the lungs. You begin with 100 mL of air at 2 atm of pressure. How would you change the pressure in your machine to accomplish your goal?
Your just got a job in the respiratory department of a large teaching hospital. You notice that the repirators are calibrated in cmH2O instead of atm or mmHg! The conversion chart that came with the new machine states that 1 mmHg = 1.36 cmH2O. How would you set the respirator to deliver a pressure of 80 mmHg?
Get a glass and fill it with cold tap water. Observe the water in the glass as it warms to room temp. What effect does temp have on the amount of gas that can remain dissolved in water? Can you use this information to explain boiling?
Explanation / Answer
For the first problem: the gas law is PV=nRT or V=1/P or P1V1=P2V2.
If you plug in the numbers, you get (2atm)(100mL)/(500mL)=P2
Because you need to increase the volume by 5 in order to get 500mL, you need to decrease the pressure by 5.
For the second problem:
multiply 1.36 cmH20 by 80 so that you will end up with 80 mmHg. 1.36 cmH20 x 80 = 108.80 cmH20