SSI Science Of Diving Practice Exam

The term "off-gassing" specifically refers to the release of inert gases, primarily nitrogen, from the body as a diver ascends after a dive. When divers breathe compressed air at depth, their bodies absorb these gases due to the increased pressure. As the diver rises to the surface and the pressure decreases, the absorbed gases begin to come out of solution and are released back into the bloodstream, eventually being expelled through respiration. This process is crucial to understand in the context of avoiding decompression sickness, also known as 'the bends,' which can occur if the ascent is too rapid, preventing a safe off-gassing of these gases.

Understanding off-gassing is vital for divers to plan safe ascent rates, utilize safety stops, and manage decompression schedules to ensure that gas bubbles do not form too quickly in the body, potentially leading to serious injuries.