When the ambient air is at 70 degrees Fahreneit, 14.7 psia, and contains 21% oxygen by volume, 4.5 lb of air are pumped into a scuba tank, capacity 0.75 ft^3. What volume of ambient air was compressed? When the filled tank has cooled to ambient conditions, what is the (gage) pressure of the air in the tank? What is the partial pressure (psia) and specific weight of the ambient oxygen? What weight of oxygen was put in the tank? What is the partial pressure (psia) and specific weight of the oxygen in the tank?