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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?

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    I would look at it from the gas law: PV=nRT or V=1/P or P1V1=P2V2.

    Plugging in the numbers, (2atm)(100mL)/(500mL)=P2

    Volume increases by 5, so pressure would have to decrease by?

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