SSI Science Of Diving Practice Exam

When outside pressure on a closed air space exceeds the internal pressure, a fundamental principle of physics comes into play. This situation results in a pressure differential that drives the air inside the closed space to compress. Thus, the air pressure inside cannot exceed the outside pressure without some form of intervention, such as an escape route for the internal air.

In this context, as external pressure rises, the internal air is effectively pushed against the walls of that closed space. This can lead to a variety of consequences depending on the scenario, such as a physical deformation of the closed space or a potential risk for harm if the pressure difference becomes too great.

Recognizing this, when we say that the pressure on the outside of a closed air space is greater than the internal pressure, it accurately reflects the condition being described. The other options do not adequately represent the physical realities of pressure differentials that occur in such scenarios.