1. The problem statement, all variables and given/known data A typical diver inhales 0.500 liters of air per breath and carries a 20. L breathing tank containing air at a pressure of 300. bar. As she dives deeper, the pressure increases by 1 bar for every 10.08 m. How many breaths can the diver take from this tank at a depth of 25 m? Assume that the temperature remains constant. 2. Relevant equations PV=nRT, T is const. 3. The attempt at a solution We worked this problem in calss toward the end of the period today, but I am still a bit confused by some of the reasoning. In calculating the final volume of the tank (at 25 m), the initial pressure and volume of the TANK are used, yet the final pressure used is that of the surroundings (i.e. 25 m * 1 bar/10.08 m). I am just looking for an explanation of why this may be carried out as so.