The Problem" If a scuba driver fills his lungs to full capacity of 5.5L when 10 m below the surface, to what volume would his lungs expand if he rose to the surface? Is this advisable? I really don't know where to go with this. I started with pv=nRT so rho(v)gh=nRT but there are still too many unknowns. How do I go about solving or starting this problem??? Answer is 11L and not advisable.