An emphysema patient is breathing pure O2 via a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of 2300 lb/in2.
(i) Determine what volume would the oxygen occupy at atmospheric pressure (and the similar temperature)?
(ii) When the patient takes in 7.0 L/min of O2 at atmospheric pressure, determine how long the cylinder will last?