Originally Posted by
rickair7777
The fluid density might make a difference, due to inertia.
But the eardrum will rupture at the same dP regardless of the fluid. I wouldn't care to put it to the test.
One atmosphere (14.7 psi) dP will pretty much rupture eardrums 100% of the time. Our relief valves go at about 9 psi, and I'd SWAG that will get you ballpark at least 50% rupture.
Please provide a reference for this hearing loss and long recovery time. I have experienced it myself and I can't find a single reference indicating a ruptured eardrum from a pressurization issue requiring any special treatment.