A diver uses an air cylinder with a volume of 11 L and filled to a pressure of 200 atm (Fig. P15.52). He dives at a leisurely pace, taking about 15 breaths per minute, and each breath is 1.2 L on average.
(a) If he must leave 17% of the air for reserve, how long can he dive at 20 m deep? The pressure must be considered as in Problem 51. 

(b) How long will his air supply last if he dives at 30 m? Approximate air as an ideal gas.

Figure P15.52

 

Data From Problem 51

A scuba diver descends to 8.2 m below the surface of the ocean.