The diving bell below contains trapped air at the same pressure as

The diving bell below contains trapped air at the same pressure as the water outside. At the surface, air pressure is 100 kPa. As the bell descends, the pressure on it increases by 100 kPa for every 10 m of depth. 


a. What is the pressure on the diver at depths of 0 m, 10m, 20m and 30m?

b. At the surface, the bell holds 6 m3 of air. If the bell is lowered to a depth of 20 m, and no more air is pumped into it, what will be the volume of the trapped air? (Assume no change in temperature.)