Question

Submarines change their depth by adding or removing air from rigid ballast tanks, thereby displacing seawater in the tanks. Consider a submarine that has a 1,200 m^3 ballast tank originally partially filled with 120 m^3 of air at 2,175 kPa. and 15 degrees C. For the submarine to surface, air at 2,175 kPa and 15 degrees C is pumped into the ballast tank in such a way that the temperature and pressure of the air remain constant until it is entirely filled with air. The seawater leaves the tank at 15 degrees C. Determine the final mass of the air in the ballast tank and the total heat transfer to the tank during this process.

Answer 1